While I think we need to do something about containers in VMs, I'm not convinced this is a good idea adding this to the regular guest agent for various reasons.
Docker is one way of running containers, but there are numerous other ones like podman or other runc/containerd based ones. So we can't really make a one size fits all solution. And that doesn't fully answer the maintenance and long-term aspect.
Well, actually what you are looking for is some form of control on guest docker runtime, but without using network, that's actually a solved problem, but plumbing is missing. And we don't need a custom docker-aware agent for this, we mostly need to use one of vsock/pv-channel/pvcalls to build a bridge between e.g guest docker socket and Xen Orchestra (which would talk to guest docker and control/get info from it).
