feat: add cloud status aware agent

[jaredallard]

Adds an agent to run docker compose on hosts. This is an optional feature.

The target for this is to allow hosts to be aware of certain conditions
and allow themselves to be stopped without ACPI signals. My main motivation
is that I use GCP right now, and for whatever reason, there's no signals being
sent when a machine is being preempted. This will enable me to check if the
node is being preempted and handle that myself.

[jaredallard]

I'll refactor the cloud package to support this better later. For now, I'd like to have this for personal reasons 😄