Add actions to run black, flake, and pytest #4

	name: linter

	on: [push]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.9", "3.10", "3.11"]

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install pylint black flake8
	- name: Code formatting using black
	run: \|
	black --check .
	- name: Analysing the code with pylint
	run: \|
	pylint $(git ls-files '*.py')
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# E203 and W503 are not compatible with black (and pep8)
	flake8 . --count --max-complexity=10 --max-line-length=127 --statistics --ignore=E203,W503

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