Only on main branch

[chillenzer]

I never quite got why CI should only be running on main branch. If you have a very extensive test suite, you might run out of credit, sure, or if you have a very specific action like a release, that is only sensible for the main branch. But for the small projects I work on (and probably it's the same for the learners in cases where they set that up by themselves), I usually start out with always running it as a default and only stepping down a bit if I run into problems with that approach. Thoughts on that?

[edbennett]

I suspect that's just because it's the default GitHub Actions template, and that in turn is to reduce the likelihood of running out of budget. I don't have strong objections to switching to testing all branches, although I'm not sure we've actually introduced branches to the learners at this point so they may not be working in them.