Make "contribution" section a bit less daunting #1278

	name: Unit tests (OS versions)

	on:
	push:
	branches:
	- main
	pull_request:
	# Run workflow when PR is changed, or when changed from draft to ready
	types: [opened, synchronize, reopened, ready_for_review]
	branches:
	- '**'

	jobs:

	build-and-test:
	name: OS unit tests
	runs-on: ${{ matrix.os }}

	# Skip job if it's a draft PR
	if: github.event.pull_request.draft == false

	strategy:
	matrix:
	os: [ubuntu-20.04, macos-latest, windows-latest]
	# Note: Ubuntu 22 is checked by other tests

	steps:
	- uses: actions/checkout@v3

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.11'

	- name: install pints
	run: \|
	python --version
	python -m pip install --upgrade pip setuptools wheel
	python -m pip install .

	- name: run unit tests
	run: \|
	python run-tests.py --unit

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