add fail_on_error: true

Author: marki1an

.github/workflows/check-style.yml

@@ -17,4 +17,4 @@ jobs:
           checkstyle_config: checkstyle.xml
           filter_mode: diff_context
           checkstyle_version: 10.17.0
-          fail_on_error: true
+          fail_on_error: 'true'