It would be nice if the device lab image was automatically rebuilt when changes to thee build recipe are submitted. Right now, I manually build it on my laptop and upload to my home directory on people.wikimedia.org, a process that takes ~45 min.
Alternatively, we could possibly run a nightly build job from cron. (This would probably require provisioning a build host, unless SRE wants to give us access to run cron jobs on one of theirs. It feels like a waste of resources, which is why I'd prefer to get it running via the pool of CI workers instead.)
When building locally, I use [[ https://github.com/go-debos/fakemachine | fakemachine ]] and QEMU to run the Arm bits. Last week I did some prototyping to verify that this should still work in a container, but it's not clear if Gitlab's other sandboxing might interfere.