Build Python distribution before pushing to PyPI (#380)
Build Python distribution before pushing to PyPI (#380)

The pypa/gh-action-pypi-publish action doesn't take care of building the
distribution.
See
https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/
p4lang/p4runtime,p4lang/p4runtime,p4lang/p4runtime