fix vale action

Author: rustagir

Diff for: .github/workflows/vale-tdbx.yml

@@ -1,8 +1,8 @@
 name: vale-checks
 on:
-  push:
-    branches-ignore:
-      - master
+  pull_request:
+    paths:
+      - "source/**"
 
 jobs:
   vale:
@@ -15,7 +15,7 @@ jobs:
       - id: files
         uses: masesgroup/retrieve-changed-files@v2
         with:
-          format: 'csv'
+          format: "csv"
 
       - name: tdbx-vale
         uses: errata-ai/vale-action@reviewdog