Rebuild and publish containers on a regular basis

[fao89]

closes #123

[mdellweg]

Nice one. However, i kind of remember from the discussion, we wanted to curate a list of releases to rebuild regularly. Also maybe this should be a separate workflow, because "every day" could be too much.
@dkliban can you help my memory here?

[bmbouter]

+1 to this as is. I like that it's nightly. I also like that it's super simple and doesn't try to be smart about what it's publishing it just goes.