Fixed
An app that pulls from this instance's own registry could not be
deployed. It failed with:
lookup cubeship-registry on 127.0.0.53:53: server misbehaving
which reads as a broken registry and is nothing of the kind. The
reference the pull was given began with the registry's container name,
and a container name is only resolvable by other containers on the same
Docker network. The pull is performed by Docker itself, which is not on
that network — so the name was never going to resolve, and the registry
it names was up and answering the whole time.
Pulls now use the registry's address on the host, which is published
either way and works whatever else is running. Nothing to change: push
and deploy as before.
It only ever affected apps whose image is pulled. An app Cubeship
builds — from a Dockerfile or with Railpack — has its image handed
straight to Docker with no pull at all, so an instance that only builds
never met this.