@app4business You can run many things at once in a docker container. It's not the usual "docker way", but it's totally possible.
Basically, I suggest you take a look at https://docs.cloudron.io/custom-apps/addons/ : these are all the services that the cloudron platform can handle on behalf of your app (in your case, I think it would be STUN/TURN and the database).
The rest, you can package all in a single container, take a look at https://docs.cloudron.io/custom-apps/guide/#multiple-processes .