Add a `docker-compose` setup to allow project contributors to quickly run the test suite on their local machines. #571

	name: Lint

	on:
	push:
	branches: [master]
	pull_request:

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php:
	- 8.1

	name: Lint code (PHP ${{ matrix.php }})

	steps:
	- uses: actions/checkout@v3
	- name: Setup PHP ${{ matrix.php }}
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	coverage: none
	extensions: dom, curl, libxml, mbstring, zip, pdo, sqlite, pdo_sqlite, bcmath, intl, gd

	- name: Cache composer dependencies
	uses: actions/cache@v2
	with:
	path: vendor
	key: composer-${{ hashFiles('composer.lock') }}

	- name: Install dependencies
	run: composer install

	- name: Lint code
	env:
	COMPOSER_MEMORY_LIMIT: "-1"
	run: composer lint

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