Use a different filter mode for vale to show how it would work in action

Author: spier

.github/workflows/vale.yml

@@ -20,5 +20,5 @@ jobs:
     - name: Vale Linting
       uses: errata-ai/vale-action@reviewdog
       with:
-        reporter: github-pr-check
         files: '["project-leader/*.asciidoc"]'
+        filter_mode: file