`GHOST_PORT` is useless as the ghost docker image listens to hardcoded port 2368

[tmlmt]

In the example .env file, there's a section that says:

ghost-docker/.env.example

Lines 49 to 52 in 1fb6d85

	# Port Ghost should listen on
	# You should only need to edit this if you want to host
	# multiple sites on the same server
	# GHOST_PORT=2368

However the only place this variable is used in the entire TryGhost org is in the compose file, which uses a wrong syntax for the expose attribute as explained in #54

In fact, the only way the port can be changed is by setting the env variable server__port=xxxx and exposing that same port in the compose file.