Update Dockerfile

Dockerfile

@@ -15,6 +15,7 @@ COPY requirements.txt requirements.txt
 COPY extract_img_pdf.py extract_img_pdf.py
 COPY live_streaming_flask.py live_streaming_flask.py
 COPY templates/ /app/templates 
+COPY reference/ /app/reference
 COPY .env .env
 COPY test_streaming.py test_streaming.py 
 COPY app_main.py app_main.py