migrate to github docker registry

[nilsnolde]

Also:

• builds latest twice a month and on master pushes, making our own versioning redundant
• tries out layer caching to accelerate image builds

fixes #68
fixes #72

[nilsnolde]

huh interesting.. didn't think I'd have the permission to push a package to your org @jcoupey , but seems it works fine. probably because it's repo-bound. are you ok with keeping latest on the schedule of 2 weeks? I did add some caching, so if nothing changed in the code base, it should hardly doing anything at all.

[nilsnolde]

This is the package URL: https://github.com/VROOM-Project/vroom-docker/pkgs/container/vroom-docker

[jcoupey]

builds latest twice a month and on master pushes

If we have a "latest" build on every master push (based on the upstream workflow that is on every PR merge), I don't really see the point of the twice a month thing. Wouldn't it be totally redundant?

[nilsnolde]

If we have a "latest" build on every master push

well, this master, not upstream master. it's not redundant bcs I don't push here often, usually just for releases. so the code would never get updated. I think it's fair, basically mirroring upstream to some degree.

[jcoupey]

Right, I did not get it was about pushes to this repo. I'm fine with this setup, especially if you have some caching involved to avoid unnecessary CI stuff.