Update extract-classnames.yml

Author: rgantzos

.github/workflows/extract-classnames.yml

@@ -26,10 +26,20 @@ jobs:
       - name: Run extraction script
         run: node .github/scripts/extract-classnames.js
 
+      - name: Check for changes
+        id: git-diff
+        run: |
+          if git diff --quiet --exit-code class-names.json; then
+            echo "changed=false" >> $GITHUB_OUTPUT
+          else
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+
       - name: Create or Update Pull Request
+        if: steps.git-diff.outputs.changed == 'true'
         uses: peter-evans/create-pull-request@v6
         with:
-          commit-message: "Update class-names.json"
+          commit-message: "Update class names file"
           branch: update-class-names
           title: "Update class-names.json"
           body: "Automated update of class-names.json"