The CI smoke test failed because docker-compose.prod.yml forced a bind mount
to /data on the host — which doesn't exist on GitHub runners.
Split the bind mount into docker-compose.host-mount.yml, which is only
composed by the VM startup script (/data exists there, mounted from the
persistent disk). CI continues to use the default named volume.
Module startup script + auto-upgrade cron now compose all three:
-f docker-compose.yml -f docker-compose.prod.yml -f docker-compose.host-mount.yml
