fix `create_source_tarball.sh` script to be compatible with recent setuptools versions #583

	name: Docs build and installation end-to-end tests

	on: [push, pull_request]

	concurrency:
	group: ${{format('{0}:{1}:{2}', github.repository, github.ref, github.workflow)}}
	cancel-in-progress: true

	jobs:
	docs:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.8
	uses: actions/setup-python@v1
	with:
	python-version: 3.8
	- name: Lint with flake8
	run: \|
	pip install flake8
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with codespell
	run: \|
	pip install codespell
	# it is (currently) impossible to dismiss ignored suggestions but these are
	# still added to the exit code (which is a just a count of spelling
	# suggestions). Since we know we have one of these, we allow for that.
	# see https://github.com/easybuilders/easybuild/pull/485 for details
	bash .github/workflows/check_with_codespell.sh
	- name: Test with sphinx
	run: \|
	pip install -r docs/requirements.txt
	# This test is weak, options -nWT would make it stronger but we have many warnings...
	READTHEDOCS=1 sphinx-build docs build
	- name: Test installation
	run: \|
	pip install .
	# test installation too (using options that don't require to have a modules tool installed)
	eb --list-easyblocks \| grep EB_bzip2
	eb --fetch bzip2-1.0.6.eb

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