How do we get rid of the scheduled unstable builds?

[francisdb]

Current situation

Every night we trigger a build First we check the latest sbt version Then we build the matrix of images

Issues

• This is a waste of cpu / space / bandwidth
• This causes unstable tags where the underlying image might change over night
• Combined this might causes our users to pull new images every time
• It's unclear from what repo state images were built

I was thinking to have the latest sbt version committed and a tag created (could be auto updated by some github action) and disabling the nightly builds.

Any other proposals are welcome.