Update Dockerfile

Dockerfile

@@ -13,4 +13,4 @@ RUN pip install --no-cache-dir requests webdavclient3
 COPY --chown=app:app sync_data.sh /home/app/uptime-kuma/
 RUN chmod +x /home/app/uptime-kuma/sync_data.sh
 EXPOSE 3001
-CMD ["/bin/sh", "-c", "./sync_data.sh & node server/server.js"]
+CMD ["/bin/sh", "-c", "./sync_data.sh & sleep 30 && node server/server.js"]