compose.yml: expose entries do not comply with docker docs

[kvnglb]

Hello maintainers,

a few days ago I learned about ghost and was curious to try it out. I flied over the compose file and was confused about the compose.yml entries in the expose section:

    expose:
      - "127.0.0.1:${GHOST_PORT:-2368}:2368"

I am not 100% sure, but according to the docker docs, expose is

Syntax is <portnum>/[<proto>] or <startport-endport>/[<proto>] for a port range. When not explicitly set, tcp protocol is used.

expose:
 - "3000"
 - "8000"
 - "8080-8085/tcp"

So no [HOST:]CONTAINER[/PROTOCOL] like for the ports.

p.s. sorry in advance for that one
I know that my coding skills suck, that I am not even rudimentary important to FOSS and one of the last people allowed to judge (I'll do it anyway):
Seriously, CLAUDE.md? This was the first time a project went from "excited when heard about it" to a tedious "oh" so fast.

[jloh]

expose:
  - "127.0.0.1:${GHOST_PORT:-2368}:2368"

The ${GHOST_PORT:-2368} portion in this expose line gets expanded like this:

1. If GHOST_PORT is set, use that
2. Else use the value 2368

What this results in is a expose line that defaults to this:

expose:
  - "127.0.0.1:2368:2368"

This tells Docker to expose port 2368 to localhost (127.0.0.1) to port 2368 inside the container. Since its all HTTP traffic and is only TCP we don't need a protocol and since we only want to use a single port we don't need port ranges.

We specify the host IP in the first portion so that Ghost is only exposed on localhost, the idea being end users will setup reverse proxies to expose them to non-local network traffic.

Hopefully this makes sense.

[tmlmt]

This issue should be reopened, as @kvnglb is correct and "127.0.0.1:${GHOST_PORT:-2368}:2368" is not a valid syntax for expose. What the compose file should ensure is that the internal port 2368 that ghost listened to is exposed to the container network. That should simply be done by:

expose: 
  - 2368

As a matter of fact, as the ghost docker image exposes port 2368, the expose attribute is not even needed in the compose file (as per the corresponding Note in the docs)

As a consequence, GHOST_PORT is also not used, but that's an other issue described in #80