Add -v --diff --dry-run to docker://oskarstark/php-cs-fixer-ga command

OskarStark/php-cs-fixer-ga#113

Now it matches the flags of our `composer cs` command.

Author: Philipp91

.github/workflows/tests.yml

@@ -46,3 +46,5 @@ jobs:
 
       - name: PHP-CS-Fixer
         uses: docker://oskarstark/php-cs-fixer-ga
+        with:
+          args: -v --diff --dry-run