Update Dockerfile

Dockerfile

@@ -12,5 +12,8 @@ RUN pip install python-multipart
 # Install requirements.txt
 RUN pip install --no-cache-dir --upgrade -r /requirements.txt
 
+# Make stockfish engines executable
+RUN chmod +x engines/*
+
 # Start the FastAPI app on port 7860, the default port expected by Spaces
 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]