Update Dockerfile

Dockerfile

@@ -91,7 +91,7 @@ RUN --mount=target=requirements.txt,source=requirements.txt \
 COPY --chown=user . $HOME/app
 
 # Copy Jupyter notebooks to data for direcly loading them.
-RUN --mount=target=/data/Wallpaper_Preference_Learning.ipynb,source=Wallpaper_Preference_Learning.ipynb
+COPY Wallpaper_Preference_Learning.ipynb /data/Wallpaper_Preference_Learning.ipynb
 
 RUN chmod +x start_server.sh