Enable pip caching for GitHub Actions #36

	name: Run CI

	on: [push, pull_request]

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ${{ matrix.os }}
	timeout-minutes: 10
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12-dev", "pypy-3.8", "pypy-3.9", "pypy-3.10"]
	os: [ubuntu-22.04, macOS-latest, windows-latest]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	# from https://github.com/actions/cache/blob/main/examples.md#python---pip
	- name: Get pip cache dir
	id: pip-cache
	shell: bash
	run: \|
	echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
	- name: pip cache
	uses: actions/cache@v3
	with:
	path: ${{ steps.pip-cache.outputs.dir }}
	# the action does not permit updating an existing cache, so we need
	# unique keys
	key: ${{ runner.os }}-${{ matrix.python-version }}-pip-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-${{ matrix.python-version }}-pip-
	- name: Install dependencies
	run: \|
	python -m pip install .
	python -m pip install -r test-requirements.txt
	- name: Run tests
	run: \|
	python -m pytest tests

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