Added markdownlint for docs. #574

	name: tests

	on: push

	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php: ['8.1', '8.2']
	steps:
	- uses: actions/checkout@v2
	- name: Install PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	extensions: yaml
	tools: composer:v2
	- name: Validate composer.json and composer.lock
	run: composer validate
	- name: Install dependencies
	run: composer install --prefer-dist --no-progress
	- name: Run tests
	run: composer test
	- name: Run static analysis
	run: composer analyse
	- name: Check PHP formatting
	run: composer format -- --dry-run

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