Upload to charmhub branches for all cases, not just for git branches named `/branch/...` about charming-actions

[simskij]

Yeah, this change makes sense to me!

[ca-scribner]

If there's any worry about always publishing to branches, a compromise would be an optional upload-to-branch-label argument (or something with a better name). If set, then the action would only upload to branches if the PR has that label (this way PRs can opt-in to branch publishing when it is needed). If unset, then the action would always publish to a branch

[simskij]

I think it's fine without that extra precaution as remote PRs won't have access to secrets and hence will fail, so to have this work, repos that want to publish to branches will have to enforce a feature branch based workflow rather than forks.