Add steps to checkout the PR branch

Author: ykoer

.github/workflows/validate.yaml

@@ -14,8 +14,23 @@ jobs:
         contains(github.event.comment.body, '/full-validation')
       )
     steps:
-      - name: Checkout
+      - name: Fetch Branch Name
+        id: fetch-branch-name
+        uses: xt0rted/pull-request-comment-branch@v2
+
+      - name: Check out code from ${{ steps.fetch-branch-name.outputs.head_ref }}
         uses: actions/checkout@v3
+        with:
+          ref: ${{ steps.fetch-branch-name.outputs.head_ref }}
+
+      - name: Post response to GitHub PR
+        uses: mshick/add-pr-comment@v2
+        with:
+          message: |
+            Action started. Click [here](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) to see the status.
+
+      # - name: Checkout
+      #   uses: actions/checkout@v3
 
       - name: Validate
         run: |
@@ -31,19 +46,7 @@ jobs:
           fi
 
 
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