Check for existing GodotRust bot reply before posting

Author: Bromeon

.github/workflows/build-website.yml

@@ -109,8 +109,36 @@ jobs:
       - name: "Deploy to GitHub Pages"
         uses: actions/deploy-pages@v4
 
-      - name: "Comment on GitHub PR"
+      # Do not comment again if there's already a bot comment.
+      # This is usually handled by checking the current state of docs in the repo's "database" file. However, in the first few minutes of
+      # opening a PR, there may be multiple doc jobs running concurrently.
+      - name: "Check for existing GodotRust comment"
+        id: check-comment
         if: github.event_name == 'repository_dispatch' && github.event.client_payload.put_status == 'Create' && github.event.client_payload.num != 'master'
+        run: |
+          repo="${{ github.event.client_payload.repo }}"
+          num="${{ github.event.client_payload.num }}"
+          
+          echo "Check for existing bot comments on PR $num..."
+          
+          commentsResponse=$(curl -L \
+            --fail-with-body \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/godot-rust/$repo/issues/$num/comments)
+          
+          existingCommentId=$(echo "$commentsResponse" | jq -r '.[] | select(.user.login == "GodotRust") | .id' | head -n1)
+          
+          if [[ -n "$existingCommentId" ]]; then
+            echo "Found existing comment from GodotRust user (ID: $existingCommentId). Skip duplicate comment."
+            echo "skip-comment=true" >> $GITHUB_OUTPUT
+          else
+            echo "No existing comment from GodotRust user found. Will post new comment."
+            echo "skip-comment=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: "Comment on GitHub PR"
+        if: github.event_name == 'repository_dispatch' && github.event.client_payload.put_status == 'Create' && github.event.client_payload.num != 'master' && steps.check-comment.outputs.skip-comment == 'false'
         run: |
           url="${{ github.event.client_payload.docs_full_url }}"
           repo="${{ github.event.client_payload.repo }}"