Simplify tox/GitHub Actions integration #30
Description
Maybe using https://github.com/tox-dev/tox-gh or https://github.com/ymyzk/tox-gh-actions so we don't need to duplicate the include/exclude lists between tox & GitHub Actions' configs?
Not sure how those would handle the Django parametrisation given that we probably do still want to have separate jobs for each element in the matrix.