Use the correct storage location in prod

Dockerfile

@@ -42,4 +42,4 @@ VOLUME ["/data"]
 EXPOSE 5000
 
 # Using the mwmbl-tinysearchengine binary/entrypoint which comes packaged with mwmbl
-CMD ["/venv/bin/mwmbl-tinysearchengine", "--num-pages", "10240000", "--background"]
+CMD ["/venv/bin/mwmbl-tinysearchengine", "--num-pages", "10240000", "--background", "--data", "/app/storage"]