Improve the usage info #443

	# This workflow will install Python dependencies, run tests and lint with a single version of Python
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python application

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	runs-on: ubuntu-20.04

	steps:
	- uses: actions/checkout@v3
	- name: Install dependencies
	run: \|
	python3 -m pip install --upgrade pip
	pip3 install flake8 pytest pyaml
	# Needed by pygit package
	sudo apt-get install python3-pygit2
	# Needed by moulin integration tests
	sudo apt-get install ninja-build
	# Install other dependencies from setup.py
	pip3 install .
	- 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
	# Run all other tests
	flake8 . --count --max-complexity=12 --max-line-length=120 --statistics
	- name: Test with pytest
	run: \|
	pytest

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