Add coding standards and psalm checks on PRs #4

	name: "Psalm"

	on:
	pull_request:
	paths:
	- '.github/workflows/psalm.yaml'
	- 'src/**'

	jobs:
	test:
	name: "Psalm"
	runs-on: ubuntu-latest

	strategy:
	fail-fast: false
	matrix:
	php-version: ['8.0', '8.1', '8.2']

	steps:
	- name: "Checkout"
	uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: 0

	- name: "Install PHP w/ Extensions"
	uses: rebilly/setup-php@main
	with:
	php-version: ${{ matrix.php-version }}
	extensions: mbstring, intl, curl, json
	tools: composer:v2

	- name: "Get composer cache directory"
	id: composer-cache
	run: \|
	echo "::set-output name=dir::$(composer config cache-files-dir)"

	- 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 --no-interaction --no-scripts --no-suggest

	- name: "Run tests"
	run: vendor/bin/psalm

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