upkeep/369: Standardize PHPCS and PHPCompatibility GH Actions #53

	name: PHP Coding Standards

	on: pull_request

	jobs:
	phpcs:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Setup proper PHP version
	uses: shivammathur/setup-php@v2
	with:
	php-version: 7.4
	tools: composer

	- name: Validate composer.json and composer.lock
	run: composer validate --strict

	- name: Get composer cache directory
	id: composer-cache
	run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT

	- name: Cache dependencies
	uses: actions/cache@v3
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install dependencies
	run: composer install

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@v35

	- name: Run PHP_CodeSniffer
	run: ./vendor/bin/phpcs ${{ steps.changed-files.outputs.all_changed_files }}

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