Adding new domains to farms not automated and requires downtime

In the current docker-compose deployments, we are no longer able to add new sites exclusively from the interface. These require adding also the new domains to the frontend.env.

A bigger problem is, that this requires also a redeployment of docker-compose, with a consequent downtime of approximately 1 minute for all sites in the farm.

This situation is far from ideal for a production environment and should ideally be reengineered.