add CI

.gitlab-ci.yml

@@ -23,6 +23,14 @@ static_analysis:
     reports:
       codequality: phpstan.json
 
+code_style:
+  script:
+    - php vendor/bin/php-cs-fixer check --config=.php-cs-fixer.dist.php --diff -v --format=gitlab --using-cache=no
+  artifacts:
+    when: always
+    reports:
+      codequality: phpstan.json
+
 unit:
   stage: test