This adds a github actions workflow to automatically build a
source distribution package of a pushed commit and publish it to PyPI,
IF the commit was tagged AND the name of the built package changed.
(i.e. if it contains the new tag or version number).
This adds a github actions workflow to automatically build a source distribution package of a pushed commit and publish it to PyPI, IF the commit was tagged AND the name of the built package changed. (i.e. if it contains the new tag or version number).