Add "ruff" linter #50

	name: CI

	on: [push, pull_request]

	jobs:
	tests:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Setup Python
	uses: actions/setup-python@v1
	with:
	python-version: "3.10"

	- name: Update pip and install pytest
	run: \|
	python -m pip install --upgrade pip
	pip install pytest

	- name: Run repository tests
	run: pytest

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