How can I bring down services managed by Docker-in-Docker/Docker-outside-of-Docker features when I shut down a dev container?

Currently the spec only supports bringing down Docker services that are explicitly provided to `runServices` in docker compose implementations. When using the Docker-in-Docker feature with pre-builds, these services appear to be left "up" inside the volume and conflict with each other.

This could be worked around if there was the ability to provide a custom shutdown action (equivalent to running `docker compose down` in the container).

I also accept that I may not be thinking about this correctly - is there a way to do this, or is this something to consider adding to the spec?