Changing port from 5432 breaks unix socket connections

[Legogris]

When changing listening port, connection is attempted to unix socket at incorrect path.

E.g., when setting PGPORT=1337 and listen: *:1337:

psql: error: could not connect to server: could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
psql: error: could not connect to server: could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
psql: error: could not connect to server: could not connect to server: No such file or directory
	Is the server running locally and accepting
	connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

[CyberDem0n]

Well, we never expected that someone will use a non-default port in docker container. Not sure that such a use-case is deserving time spent on it.

[Legogris]

Then maybe the env var should be removed? The docs currently state it as configurable.

[CyberDem0n]

Maybe if you add PGPORT here it will fix the issue, that would be an easy win.