Test PyPI Support

[Behemyth]

TestPyPI allows for the testing of release workflows concurrent to project development. The site is analogous to pypi.org in every way and requires an additional account. Artifacts are not retained and are deleted according to the site rules.

I suggest publishing to TestPyPI every time a successful push is made to the dev branch. The version that is to be uploaded to TestPyPi might include an additional number, a build ID. ...

It may be a better solution to publish to the test site for every successful push. Maintained release branches would benefit from workflow and publishing testing in this case.