Update README.md #1174

	name: Python CI

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	# repository code
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	fetch-depth: 2

	# set up
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.9'

	# dependencies, if any
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	if [ -f workbook/ch03/ci/requirements.txt ]; then pip install -r requirements.txt; fi

	# PYTHONPATH (include script's parent directory, if needed)
	- name: Set PYTHONPATH
	run: echo "PYTHONPATH=$PYTHONPATH:$(pwd)/workbook/ch03/ci" >> $GITHUB_ENV

	# check where we are? /home/runner/work/bb/bb
	- name: Print working directory
	run: pwd

	# right place and files?
	- name: List files
	run: ls -R workbook/ch03/ci

	# unit tests using Python's unittest: workbook/ch03/ci
	- name: Run tests
	run: \|
	python -m unittest discover -s workbook/ch03/ci -p 'test_*.py'

Provide feedback