ci for php-cs-fixer and phpstan

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+    tests:
+        name: PHPUnit PHP ${{ matrix.php }} ${{ matrix.dependency }} (Symfony ${{ matrix.symfony }})
+        runs-on: ubuntu-22.04
+        strategy:
+            matrix:
+                php:
+                    - '8.1'
+                    - '8.2'
+                    - '8.3'
+                symfony:
+                    - '5.4.*'
+                    - '6.4.*'
+            fail-fast: true
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+
+            - name: Configure Symfony
+              run: composer config extra.symfony.require "${{ matrix.symfony }}"
+
+            - name: Update project dependencies
+              run: composer update --no-progress --ansi --prefer-stable
+
+            - name: Validate composer
+              run: composer validate --strict --no-check-lock
+
+            - name: PHP-CS-Fixer
+              run: vendor/bin/php-cs-fixer check -vv
+
+            - name: PHPStan
+              run: vendor/bin/phpstan analyse