Feature request: sub-icon for Node

[sumanthratna]

I'd like to create a diagram for my Docker Compose setup: my Django project, Redis, Postgres, and Memcached are all in their own Docker containers.

I could create a cluster/group for each component, where each group would have 1 Docker Node and the component node, but this seems a little unintuitive. I'd like to be able to indicate that each of my components are running in a Docker container by showing a small Docker icon in the bottom-right corner of the component icon. It might be possible to do what I wnt by plying with attrs but this seems hacky.

[clayms]

Have a look at this solution:

#279 (comment)