Bump actions/checkout from 2 to 4 (#123) #549

	name: build
	on: [pull_request, push]

	permissions:
	contents: read # to fetch code (actions/checkout)

	jobs:
	testing:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11']
	steps:
	- uses: actions/checkout@v4
	- run: \|
	docker build -f bin/all.Dockerfile \
	--build-arg PYTHON_VERSION=${{ matrix.python-version }} \
	--tag shimmy-docker .
	- name: Run tests
	run: docker run shimmy-docker pytest

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