Enforce code style

Author: vojtech-dobes

.github/workflows/checks.yml

@@ -7,6 +7,24 @@ env:
   COMPOSER_NO_INTERACTION: "1"
 
 jobs:
+  format:
+    name: Code style
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          coverage: none
+
+      - run: composer install --ansi --no-progress --prefer-dist
+
+      - name: Run PHP_Codesniffer
+        run: vendor/bin/phpcs
+
   static_analysis:
     name: Static analysis
 

composer.json

@@ -17,6 +17,9 @@
 		}
 	},
 	"config": {
+		"allow-plugins": {
+			"dealerdirect/phpcodesniffer-composer-installer": false
+		},
 		"sort-packages": true
 	},
 	"keywords": [
@@ -42,6 +45,7 @@
 		"phpunit/phpunit": "^12.1",
 		"spaze/phpstan-disallowed-calls": "^4.5.0",
 		"tracy/tracy": "^2.10.9",
+		"vojtech-dobes/php-codestyle": "~0.2.0",
 		"vojtech-dobes/php-grammar-processing": "dev-master@dev",
 		"vojtech-dobes/php-graphql-server": "dev-master@dev"
 	},