connect_address give possibility to specify listen address and connect
address separetely, so there is no need to determine your external
address by doing requests to amazon api.
For example you can listen on 0.0.0.0 but provide service on some
didicated ip. This should cover all possible use-cases when you are
running behind firewall, load balancer or inside for example docker.
Create a superuser role with a given name and password (or change
the postgres role if the name is not given). Also, create an admin
role with the name and the password provided. The admin role has
CREATEDB and CREATEROLE permisssions, effectively making it the
most powerful role after the superuser.
When PostgreSQL is running inside the docker container, it should provide
the address of the host it's running on and not the address from inside
of the container to the outside world.
