Add test_permissions.py to Dockerfile for environment setup verification

Dockerfile

@@ -76,6 +76,7 @@ RUN mkdir -p /app/.streamlit /tmp/docling_temp /tmp/easyocr_models /tmp/cache /t
 
 COPY requirements.txt ./
 COPY src/ ./src/
+COPY test_permissions.py ./
 
 # Create Streamlit config directly in Dockerfile to avoid copy issues
 RUN echo '[global]' > /app/.streamlit/config.toml && \