Can we publish to PyPI from different branches?

[tcompa]

#2015 did work, but it partly breaks the history of versions and it would be suboptimal for a more complex bugfix.

Let's check whether the GHA that publishes to PyPI can be modified so that it can run on-demand on any given branch. If so, we'd have a way to avoid installing from GitHub.

[tcompa]

This will be most likely necessary, starting from #2168

[tcompa]

We could not do this with the original bumpver version (2022.x), but recent versions support the --ignore-vcs-tag flag.
With this flag on, we can do something like

• From main: bumpver update --set-version 4.0.0 --tag-commit --commit
• From dev: bumpver update --set-version 4.1.a0 --tag-commit --commit
• From main: bumpver update --set-version 4.0.2 --tag-commit --commit --ignore-vcs-tag

[tcompa]

Here is an example:

1. We released a bunch of 2.11.0 prereleases from dev-2.11
2. We released 2.10.6 from main
3. We merged main into dev-2.11 (47593f8)