Update README.md #21

	name: Continuous integration tests

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

	jobs:
	ci:
	name: Continuous integration tests
	runs-on: ubuntu-latest
	services:
	# Label used to access the service container
	postgis:
	# Docker Hub image
	image: postgis/postgis:16-3.4-alpine
	# Provide the password for postgres
	env:
	POSTGRES_PASSWORD: postgres
	# Set health checks to wait until postgres has started
	options: >-
	--health-cmd pg_isready --health-interval 10s --health-timeout 5s
	--health-retries 5
	ports:
	# Maps tcp port 5432 on service container to the host
	- 5432:5432
	steps:
	- uses: actions/checkout@v4
	- name: Install Python
	uses: actions/setup-python@v4
	- name: Install Poetry
	uses: abatilo/actions-poetry@v2
	- name: Setup a local virtual environment (if no poetry.toml file)
	run: \|
	poetry config virtualenvs.create true --local
	poetry config virtualenvs.in-project true --local
	- uses: actions/cache@v3
	name:
	Define a cache for the virtual environment based on the dependencies
	lock file
	with:
	path: ./.venv
	key: venv-${{ hashFiles('poetry.lock') }}
	- name: Install the project dependencies
	run: poetry install
	# Create a PostGIS database (in a Docker container) for tests
	- name: Run the automated tests
	run: make test
	env:
	TOPO_TESTING_DATABASE_URL: postgresql://postgres:postgres@localhost:5432/mapboard_topology_test

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