It is fun to learn, but it sucks to yak-shave [1] all the time.
The simplicity of the stack lets me walk away for days (or years) at a time, come back, and easily ship changes. No need to remember esoteric commands, configs, or get bitten by strange infrastructure upgrades.
I'm lazy, and I'm just looking for ways to be lazier. :-)
Adding the port declaration to the docker file exposes it to other containers on the same network/machine, adding it in docker-compose exposes it to the world.
I explicitly bind the external port only to the ZeroTier interface. In fact, my configs have changed a bit:
instead of:
ports:
- 5432:5432
ports:
- 192.168.111.123:5432:5432