Update actions/checkout action to v4 #1

	name: Python application

	on: [push]

	jobs:
	build:
	name: Lint & Test (flake8 & pytest)

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0 # Shallow clones disabled for sonarcloud
	- name: Set up Python 3.8
	uses: actions/setup-python@v1
	with:
	python-version: 3.8
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	pip install -r prototypes/requirements.txt
	pip install -r tests/requirements.txt
	pip install pytest-xvfb
	- 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
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with pytest
	run: \|
	sudo apt-get install libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0
	pytest --cov=./ --cov-report=xml
	# - name: Analyse with SonarCloud
	# uses: SonarSource/sonarcloud-github-action@master
	# env:
	# GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Needed to get PR information, if any
	# SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

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