Bake release version semver into images as environment variable

[system]

It would be good to have a BALENA_RELEASE_SEMVER environment variable, like we already have for the commit of the release, and for the HostOS and supervisor’s versions (e.g.: BALENA_HOST_OS_VERSION=balenaOS 5.3.7)

In order to get the semver of a release from within a running container, it is necessary to do a first call to the supervisor API to retrieve the releaseId (this requires label io.balena.features.supervisor-api), and a second call to balena api with this number in order to get the raw_version semver.

The process is explained in this thread:

Getting release version inside device

Hey there, Assuming you are doing this from within a container running on the device (hence the mention of the supervisor), I think the easiest way will be to use the supervisor to retrieve the releaseID, then use the releaseID to request the data from the balena API. To retrive the releaseID: Interacting with the balena Supervisor - Balena Documentation Release resource documentation: Resources - Balena Documentation You’ll see that the semver field combined with the revision field hold the…