This directory contains helper code and configuration files used to build a Python package for Makefile.venv and to upload that package to PyPI.
It is assumed that Makefile.venv itself is in a working state when working on packaging, so we depend on it in multiple places here.
This is also the reason why packaging tests are stored separately from the rest of test suite: we can not depend on Makefile.venv in the main test suite, but it's too useful to forego when doing auxiliary work.