Ok, let’s go back to earth 
Based on this, I did this docker-compose.
This should be easier to scale than the original one and follow docker principles (although, it can be better engineered).
It is just a proof of concept for now, but as an IndieHoster, I’m selling the hosting service, and I’m comited to maintain this.
Let me know if you need any help to get started with that!
All the best!
Pierre