Add plumbing to allow callers to choose to use pwsh7 or not #879

	name: Python Tests
	on: [push, pull_request]
	jobs:
	python_tests:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.9', '3.10']
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	- name: Test python
	run: python -m unittest discover -s . -p '*_test.py'

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