Add a demo db to Dockerfile

Start with a few entries instead of totally empty.

Dockerfile

@@ -27,6 +27,7 @@ COPY --chown=user "demo.py" .
 EXPOSE 7860 8080
 ENV GRADIO_SERVER_NAME="0.0.0.0"
 
+COPY demo-sqlite-data.db sqlite-data.db
 COPY --chown=user "start.sh" .
 RUN chmod +x "start.sh"