Check for md files only and comment

.github/workflows/notify-docs-triagers.yml

@@ -1,20 +1,24 @@
 name: Notify Docs-triagers
+
 on:
   pull_request:
   push:
     branches:
       - master
+
 jobs:
   Notify-triagers:
     runs-on: ubuntu-latest
     steps:
-        - name: Check PR Changes
-          id: pr-changes
-          run: echo "::set-output name=changes::${{ toJson(github.event.pull_request.changed_files) }}"
+      - name: Check PR Changes
+        id: pr-changes
+        run: |
+          md_files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '\.md$' || true)
+          echo "::set-output name=md_changes::${md_files}"
 
-        - name: Create Comment
-          if: steps.pr-changes.outputs.changes != '[]'
-          uses: mshick/[email protected]
-          with:
-            message: "This is a test comment to check workflow"
-            repo-token: ${{secrets.GH_TOKEN}}
+      - name: Create Comment
+        if: steps.pr-changes.outputs.md_changes != ''
+        uses: mshick/[email protected]
+        with:
+          message: "This is a test comment to check workflow for changes to Markdown files."
+          repo-token: ${{ secrets.GH_TOKEN }}