update the flows

Author: chienyuanchang

.github/workflows/auto_review_documentation.yml

@@ -19,6 +19,7 @@ jobs:
       AZURE_OPENAI_API_VERSION: "2024-12-01-preview"
       GITHUB_TOKEN: ${{ secrets.TOKEN_GITHUB }}
       REPO_NAME: "Azure-Samples/azure-ai-content-understanding-python"
+      DOC_FILE_FILTER: '\.md$|\.rst$|README|\.ipynb$'
 
     steps:
       - name: Checkout code
@@ -42,8 +43,11 @@ jobs:
           # Retrieve list of files changed between the previous commit and the current SHA
           git diff --name-only ${{ github.event.before }} ${{ github.sha }} > changed_files.txt 
           # filter to include only documentation files (e.g., .md, .rst, README, .ipynb)
-          grep -E '\.md$|\.rst$|README|\.ipynb$' changed_files.txt || true > changed_docs.txt
+          grep -E "${DOC_FILE_FILTER}" changed_files.txt || true > changed_docs.txt
+          echo "Files changed with DOC_FILE_FILTER (${DOC_FILE_FILTER}) — could be empty:"
+          echo "---------------------------------------------------------------"
           cat changed_docs.txt
+          echo "---------------------------------------------------------------"
 
       - name: Azure Login
         uses: azure/login@v2
@@ -54,9 +58,13 @@ jobs:
 
       - name: Run review script on each file
         run: |
-          while read file; do
-            if [ -n "$file" ]; then
-              echo "Running review script on file: $file"
-              INPUT_FILE_PATH="$file" python tools/review_file/review_file.py
-            fi
-          done < changed_docs.txt
+          if [ ! -s changed_docs.txt ]; then
+            echo "No documentation files changed matching DOC_FILE_FILTER (${DOC_FILE_FILTER}). Skipping review step."
+          else
+            while read file; do
+              if [ -n "$file" ]; then
+                echo "Running review script on file: $file"
+                INPUT_FILE_PATH="$file" python tools/review_file/review_file.py
+              fi
+            done < changed_docs.txt
+          fi