Add workflow-template for publishing Python project to PyPI

[sbesson]

Primarily inspired by the work on omero-cli-zarr this should make the standard publish to PyPI on tags workflow activatable at minimal cost across projects.

/cc @ome/python

[joshmoore]

Good to have beaten on this a bit via ome/omero-cli-zarr#37 and ome/omero-cli-zarr#41 😉

[sbesson]

Also including ome/omero-cli-zarr@ec0bebd in the history.

Short version: this all started as an honorable attempt to create a template workflow implementing https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/#publishing-the-distribution-to-pypi-and-testpypi but in practice ended up with a more simple but effective publishing of tags to PyPi.

[jburel]

Maybe a file like REFERENCES.md could be useful to capture link https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/#publishing-the-distribution-to-pypi-and-testpypi in case one would like for example to use testpypi

[sbesson]

Would this file be stored under workflow-templates ? Do you have an example somewhere we could inherit?
Otherwise, I can add a reference in the template itself if that's useful.

[jburel]

I don't have any example. I was thinking that it could be alongside of the readme and other files
I think it could become a list of references not only associate to workflow e.g. hack.md

[sbesson]

Pushed f41ca70

[jburel]

Thanks for capturing the reference