The output with --debug in the balena preload command
$ balena preload --debug --dockerHost docker --dockerPort 2375 $PWD/balena.img --fleet $BALENA_FLEET --commit current
[282](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L282)[debug] new argv=[/builds/romain.bethenod/system-preparation/balena-cli/balena,/snapshot/versioned-source/bin/balena,preload,--dockerHost,docker,--dockerPort,2375,/builds/romain.bethenod/system-preparation/balena.img,--fleet,Romain,--commit,current] length=12
[283](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L283)[debug] Deprecation check: 0.00056 days since last npm registry query for next major version release date.
[284](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L284)[debug] Will not query the registry again until at least 7 days have passed.
[285](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L285)Building Docker preloader image. [ ] 0%
[286](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L286)
[287](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L287)Building Docker preloader image. [=== ] 12%
[288](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L288)Step 1/7 : FROM alpine:3.12
[289](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L289) ---> 13621d1b12d4
[290](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L290)
[291](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L291)Building Docker preloader image. [====== ] 25%
[292](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L292)Step 2/7 : WORKDIR /usr/src/app
[293](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L293) ---> Running in e4753602c7b3
[294](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L294)Removing intermediate container e4753602c7b3
[295](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L295) ---> d1715e469a99
[296](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L296)
[297](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L297)Building Docker preloader image. [========= ] 37%
[298](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L298)Step 3/7 : RUN apk add --no-cache curl py3-pip parted btrfs-progs util-linux sfdisk file coreutils sgdisk e2fsprogs-extra docker
[299](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L299) ---> Running in e25d42364746
[300](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L300)fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
[301](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L301)fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
[302](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L302)(1/83) Installing libblkid (2.35.2-r0)
[303](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L303)(2/83) Installing lzo (2.10-r2)
[304](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L304)(3/83) Installing libuuid (2.35.2-r0)
[305](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L305)(4/83) Installing zstd-libs (1.4.9-r0)
[306](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L306)(5/83) Installing btrfs-progs (5.6.1-r0)
[307](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L307)(6/83) Installing libacl (2.2.53-r0)
[308](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L308)(7/83) Installing libattr (2.4.48-r0)
[309](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L309)(8/83) Installing coreutils (8.32-r0)
[310](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L310)(9/83) Installing ca-certificates (20191127-r4)
[311](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L311)(10/83) Installing nghttp2-libs (1.41.0-r0)
[312](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L312)(11/83) Installing libcurl (7.78.0-r0)
[313](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L313)(12/83) Installing curl (7.78.0-r0)
[314](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L314)(13/83) Installing libseccomp (2.4.4-r0)
[315](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L315)(14/83) Installing runc (1.0.0_rc95-r0)
[316](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L316)(15/83) Installing containerd (1.4.4-r0)
[317](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L317)(16/83) Installing libmnl (1.0.4-r0)
[318](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L318)(17/83) Installing libnftnl-libs (1.1.6-r0)
[319](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L319)(18/83) Installing iptables (1.8.4-r2)
[320](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L320)(19/83) Installing tini-static (0.19.0-r0)
[321](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L321)(20/83) Installing device-mapper-libs (2.02.186-r1)
[322](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L322)(21/83) Installing docker-engine (20.10.3-r0)
[323](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L323)(22/83) Installing docker-cli (20.10.3-r0)
[324](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L324)(23/83) Installing docker (20.10.3-r0)
[325](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L325)Executing docker-20.10.3-r0.pre-install
[326](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L326)(24/83) Installing libcom_err (1.45.6-r0)
[327](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L327)(25/83) Installing e2fsprogs-libs (1.45.6-r0)
[328](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L328)(26/83) Installing e2fsprogs (1.45.6-r0)
[329](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L329)(27/83) Installing e2fsprogs-extra (1.45.6-r0)
[330](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L330)(28/83) Installing libmagic (5.38-r0)
[331](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L331)(29/83) Installing file (5.38-r0)
[332](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L332)(30/83) Installing ncurses-terminfo-base (6.2_p20200523-r0)
[333](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L333)(31/83) Installing ncurses-libs (6.2_p20200523-r0)
[334](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L334)(32/83) Installing readline (8.0.4-r0)
[335](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L335)(33/83) Installing parted (3.3-r0)
[336](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L336)(34/83) Installing libbz2 (1.0.8-r1)
[337](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L337)(35/83) Installing expat (2.2.9-r1)
[338](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L338)(36/83) Installing libffi (3.3-r2)
[339](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L339)(37/83) Installing gdbm (1.13-r1)
[340](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L340)(38/83) Installing xz-libs (5.2.5-r0)
[341](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L341)(39/83) Installing sqlite-libs (3.32.1-r1)
[342](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L342)(40/83) Installing python3 (3.8.10-r0)
[343](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L343)(41/83) Installing py3-appdirs (1.4.4-r1)
[344](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L344)(42/83) Installing py3-ordered-set (4.0.1-r0)
[345](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L345)(43/83) Installing py3-parsing (2.4.7-r0)
[346](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L346)(44/83) Installing py3-six (1.15.0-r0)
[347](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L347)(45/83) Installing py3-packaging (20.4-r0)
[348](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L348)(46/83) Installing py3-setuptools (47.0.0-r0)
[349](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L349)(47/83) Installing py3-chardet (3.0.4-r4)
[350](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L350)(48/83) Installing py3-idna (2.9-r0)
[351](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L351)(49/83) Installing py3-certifi (2020.4.5.1-r0)
[352](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L352)(50/83) Installing py3-urllib3 (1.25.9-r0)
[353](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L353)(51/83) Installing py3-requests (2.23.0-r0)
[354](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L354)(52/83) Installing py3-msgpack (1.0.0-r0)
[355](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L355)(53/83) Installing py3-lockfile (0.12.2-r3)
[356](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L356)(54/83) Installing py3-cachecontrol (0.12.6-r0)
[357](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L357)(55/83) Installing py3-colorama (0.4.3-r0)
[358](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L358)(56/83) Installing py3-distlib (0.3.0-r0)
[359](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L359)(57/83) Installing py3-distro (1.5.0-r1)
[360](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L360)(58/83) Installing py3-webencodings (0.5.1-r3)
[361](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L361)(59/83) Installing py3-html5lib (1.0.1-r4)
[362](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L362)(60/83) Installing py3-pytoml (0.1.21-r0)
[363](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L363)(61/83) Installing py3-pep517 (0.8.2-r0)
[364](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L364)(62/83) Installing py3-progress (1.5-r0)
[365](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L365)(63/83) Installing py3-toml (0.10.1-r0)
[366](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L366)(64/83) Installing py3-retrying (1.3.3-r0)
[367](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L367)(65/83) Installing py3-contextlib2 (0.6.0-r0)
[368](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L368)(66/83) Installing py3-pip (20.1.1-r0)
[369](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L369)(67/83) Installing libfdisk (2.35.2-r0)
[370](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L370)(68/83) Installing libsmartcols (2.35.2-r0)
[371](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L371)(69/83) Installing sfdisk (2.35.2-r0)
[372](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L372)(70/83) Installing libgcc (9.3.0-r2)
[373](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L373)(71/83) Installing popt (1.16-r7)
[374](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L374)(72/83) Installing libstdc++ (9.3.0-r2)
[375](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L375)(73/83) Installing sgdisk (1.0.6-r0)
[376](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L376)(74/83) Installing blkid (2.35.2-r0)
[377](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L377)(75/83) Installing libcap-ng (0.7.10-r1)
[378](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L378)(76/83) Installing setpriv (2.35.2-r0)
[379](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L379)(77/83) Installing libmount (2.35.2-r0)
[380](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L380)(78/83) Installing findmnt (2.35.2-r0)
[381](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L381)(79/83) Installing mcookie (2.35.2-r0)
[382](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L382)(80/83) Installing hexdump (2.35.2-r0)
[383](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L383)(81/83) Installing lsblk (2.35.2-r0)
[384](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L384)(82/83) Installing cfdisk (2.35.2-r0)
[385](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L385)(83/83) Installing util-linux (2.35.2-r0)
[386](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L386)Executing busybox-1.31.1-r20.trigger
[387](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L387)Executing ca-certificates-20191127-r4.trigger
[388](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L388)OK: 380 MiB in 97 packages
[389](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L389)Removing intermediate container e25d42364746
[390](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L390) ---> e5e3db540a09
[391](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L391)
[392](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L392)Building Docker preloader image. [============ ] 50%
[393](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L393)Step 4/7 : COPY requirements.txt ./
[394](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L394) ---> 3b88cca001a8
[395](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L395)
[396](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L396)Building Docker preloader image. [=============== ] 62%
[397](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L397)Step 5/7 : RUN pip3 install --no-cache-dir -r requirements.txt
[398](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L398) ---> Running in 3c6fb41dcde2
[399](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L399)Collecting sh==1.12.14
[400](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L400) Downloading sh-1.12.14-py2.py3-none-any.whl (38 kB)
[401](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L401)Collecting retry==0.9.2
[402](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L402) Downloading retry-0.9.2-py2.py3-none-any.whl (8.0 kB)
[403](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L403)Collecting decorator>=3.4.2
[404](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L404) Downloading decorator-5.0.9-py3-none-any.whl (8.9 kB)
[405](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L405)Collecting py<2.0.0,>=1.4.26
[406](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L406) Downloading py-1.10.0-py2.py3-none-any.whl (97 kB)
[407](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L407)Installing collected packages: sh, decorator, py, retry
[408](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L408)Successfully installed decorator-5.0.9 py-1.10.0 retry-0.9.2 sh-1.12.14
[409](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L409)Removing intermediate container 3c6fb41dcde2
[410](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L410) ---> 916e53740719
[411](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L411)
[412](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L412)Building Docker preloader image. [================== ] 75%
[413](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L413)Step 6/7 : COPY src/ ./
[414](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L414) ---> 69152afbc9bc
[415](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L415)
[416](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L416)Building Docker preloader image. [===================== ] 87%
[417](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L417)Step 7/7 : CMD ["python3", "/usr/src/app/preload.py"]
[418](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L418) ---> Running in d80404fb9d2a
[419](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L419)Removing intermediate container d80404fb9d2a
[420](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L420) ---> ef40772206bb
[421](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L421)Successfully built ef40772206bb
[422](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L422)Successfully tagged balena/balena-preload:latest
[423](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L423)
[424](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L424)Building Docker preloader image. [========================] 100%
[425](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L425)Waiting for Docker to start...
[426](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L426)Docker started
[427](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L427)Leaving splash image alone
[428](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L428)Expanding partition n°16 of /img/balena.img
[429](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L429)Resizing ext4 filesystem of partition n°16 of /img/balena.img using /dev/loop0
[430](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L430)File system OK
[431](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L431)Waiting for Docker to start...
[432](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L432)Docker started
[433](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L433)ECONNREFUSED: connect ECONNREFUSED 0.0.0.0:37111
[434](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L434)Error: connect ECONNREFUSED 0.0.0.0:37111
[435](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L435) at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)
[436](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L436)From previous event:
[437](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L437) at runCallback (timers.js:705:18)
[438](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L438) at tryOnImmediate (timers.js:676:5)
[439](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L439) at processImmediate (timers.js:658:5)
[440](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L440) at process.topLevelDomainCallback (domain.js:126:23)
[441](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L441)From previous event:
[442](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L442) at preload.Bluebird.resolve.then (/snapshot/versioned-source/node_modules/balena-preload/build/preload.js:751:28)
[443](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L443)For further help or support, visit:
[444](https://gitlab.com/romain.bethenod/system-preparation/-/jobs/1541813018#L444)https://www.balena.io/docs/reference/balena-cli/#support-faq-and-troubleshooting
To my understanding docker in docker is supported on Gitlab. You can take a look here: Use Docker to build Docker images | GitLab
Do you mean here to get a Gitlab runner which can execute docker commands directly? Yes sure it should work but how to get one from the Gitlab shared runner? I’d strongly prefer to not have to maintain a server just for a job.