enhancement/docs - tweaking readme file #303

	name: "Python linter"
	on:
	pull_request:
	jobs:
	lint:
	name: "Running cardboardlinter"
	runs-on: ubuntu-20.04
	container:
	image: python:3.9.4-slim-buster
	steps:
	# https://github.com/actions/checkout/issues/175#issuecomment-595410280
	- run: \|
	apt-get -qq -y update
	apt-get -qq -y install git
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- run: \|
	pip install --upgrade cardboardlint pylint
	- run: \|
	set -ex
	# Check if branch can be merged with master (if failing script will stop due to set -e)
	git config user.email "[email protected]"
	git config user.name "Your Name"
	git merge --no-commit --no-ff origin/${{ github.base_ref }}
	- run: \|
	set -ex
	# Undo merge changes if any
	git reset --hard ${{ github.sha }}
	- run: \|
	set -ex
	# Lint differences against master
	cardboardlinter --refspec origin/${{ github.base_ref }} -n auto;

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