Error on build test: could not package, setuptools within Tox

[cpstrommen]

Recurring issue on commit build testing, previous errors can be seen in the GitHub actions tab. All configuration for testing is in setup.py for tox.ini and in the test directory /tests/test_simple.py

Preliminary investigation hints to a problem installing setuptools in the build environment or it could be a Tox configuration error.

.package create: /home/runner/work/plcd/plcd/.tox/.package
.package installdeps: setuptools>=43.0.0, wheel
error: package directory 'plcd' does not exist
ERROR: invocation failed (exit code 1), logfile: /home/runner/work/plcd/plcd/.tox/.package/log/.package-2.log
================================== log start ===================================
running egg_info
creating plcd.egg-info
writing plcd.egg-info/PKG-INFO
writing dependency_links to plcd.egg-info/dependency_links.txt
writing top-level names to plcd.egg-info/top_level.txt
writing manifest file 'plcd.egg-info/SOURCES.txt'

=================================== log end ====================================
ERROR: FAIL could not package project - v = InvocationError("/home/runner/work/plcd/plcd/.tox/.package/bin/python /opt/hostedtoolcache/Python/3.7.[13](https://github.com/LibreCS/plcd/runs/7527885437?check_suite_focus=true#step:5:14)/x64/lib/python3.7/site-packages/tox/helper/build_requires.py setuptools.build_meta '' ''", 1)
Error: Process completed with exit code 2.

[cpstrommen]

Switched from setuptools to hatchling and temporarily disabled pytest