This morning (Sun, 3/11, SAST), I see this on a number of my builds (across different Resin applications). It appears to get to the image upload step after a successful build, but then gets stuck at 33% and then fails as you see here:
[main] Successfully built 9d2313c6e010
[Info] Uploading images
[================> ] 33%[Info] Still working...
[Success] Successfully uploaded images
[Error] This build has been cancelled
[Error] Not deploying release.
remote: error: hook declined to update refs/heads/master
To git.resin.io:*****/****.git
! [remote rejected] master -> master (hook declined)
error: failed to push some refs to '****@git.resin.io:******/******.git'