There is already a non-piped docker-compose setup. The installer just downloads the compose file and env.example, and you can also get them manually from GitHub.

You don’t need to set APP_PORT. If it’s unset, the app falls back to the PORT var provided by Portainer. Just make sure APP_URL exactly matches the root path you’re using behind Nginx.

I know from a friend his deployment running fine on Portainer, so it should work with a standard setup.