Post release checklist as a comment on release PRs (#7307)

.github/workflows/create-release-pr.yaml

@@ -101,10 +101,18 @@ jobs:
 
     - name: Create Pull Request
       run: |
-        gh pr create \
+        PR_URL=$(gh pr create \
           -B "$TARGET_BRANCH" \
           -H "${{ env.branch_name }}" \
           --title "chore(release): release version ${{ env.version }} ($BUMP_TYPE)" \
-          --body-file pr_body.txt
+          --body-file pr_body.txt)
+        echo "pr_url=$PR_URL" >> $GITHUB_ENV
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Post release checklist comment
+      run: |
+        sed 's/{{VERSION}}/${{ env.version }}/g' RELEASE_CHECKLIST.md > checklist_comment.md
+        gh pr comment "${{ env.pr_url }}" --body-file checklist_comment.md
       env:
         GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}