Run PR-labeler-config-validator only if config changes

.github/workflows/pr-labeler-config-validator.yml

@@ -1,11 +1,7 @@
 name: Validate PR Labeler Configuration
 on:
-  push: {}
+  push:
   pull_request:
-    types:
-      - opened
-      - synchronize
-      - ready_for_review
 
 jobs:
   pr-labeler:
@@ -13,7 +9,14 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v3
+      - uses: dorny/paths-filter@v2
+        id: filter
+        with:
+          filters: |
+            pr-labeller:
+              - '.github/pr-labeler.yml'
       - name: Validate Configuration
+        if: steps.filter.outputs.pr-labeller == 'true'
         uses: Yash-Singh1/pr-labeler-config-validator@releases/v0.0.3
         with:
           configuration-path: .github/pr-labeler.yml