Update Dockerfile

Dockerfile

@@ -12,7 +12,7 @@ RUN apt-get update \
 WORKDIR /
 
 # Install requirements.txt 
-RUN pip install --no-cache-dir --upgrade -r /requirements.txt
+RUN pip install --no-cache-dir --upgrade -r backend/requirements.txt
 
 # Start the FastAPI app on port 7860, the default port expected by Spaces
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]