sdist is missing `tox.ini`

[mtelka]

The sdist package at PyPI is missing the tox.ini file. Please add the missing file to sdist to make downstream testing easier. Thank you.

[Dreamsorcerer]

I don't think we use tox anymore. It's all handled through Github actions. The file can probably be deleted.

[mtelka]

The tox.ini is the preferred way to run tests while packaging Python projects for OpenIndiana. It is the only method that currently works fully automatic. All other methods needs some extra manual work. So if possible (and if the tox.ini is working) I vote for keeping it.

[webknjaz]

Yeah, I'd like to have it working, but it's currently unmaintained. I'm yet to fix the way of using it in the org but will probably start the experiments in propcache.