Automate new docker releases

[luckydonald]

Description

It kinda is a bit of an annoyance that it takes about another week until a new docker release is available as someone unfortunately has to manually bump the version and that has to go through a release process.

Especially since it's most of the time just a simple one line change.

I'd rather have it automatically (update that line and) build a container and push that, instead of waiting for people to manually update it.
Even if that comes with the risk of some dependency (e.g. apt-get install stuff) being broken as nobody is actually looking at the builds. But if that happens we can always fix it manually again, as we did in the past.

[crazy-max]

It needs testing before releasing, we can't blindly bump and push. If we can provide e2e tests, then we could consider it.

[luckydonald]

Yeah, that totally makes sense.

Still in some cases I'd rather be able to update, knowing I might suffer consequences and test and report back any issues, if a new release is there.

Would automatically pushing an explicit non-latest tag like :nighly-1.2.3 or :automated-test-build-1.2.3 be something you would consider?