Add Composer caching #46

	name: Continuous Integration
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php-versions:
	- '7.4'
	- '8.0'
	- '8.1'
	- '8.2'
	- '8.3'

	steps:
	- uses: actions/checkout@v2

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-versions }}

	- name: Analysing source code
	run: find ./src/ ./inc/ ./tests/ -type f -name '*.php' -print0 \| xargs -0 -L 1 -P 4 -- php -l

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

	- name: Get Composer Cache Directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"

	- name: Cache dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: \|
	${{ runner.os }}-composer-

	- name: Install dependencies
	uses: ramsey/composer-install@v1
	with:
	dependency-versions: highest
	composer-options: "--prefer-dist"

	- name: PHPUnit
	run: ./vendor/bin/phpunit

	- name: Psalm
	run: ./vendor/bin/psalm --show-info=false --threads=8 --diff

	- name: PHPCS
	run: ./vendor/bin/phpcs -s --report-source --runtime-set ignore_warnings_on_exit 1

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