add mount-checkout option from docker-buildkite-plugin

[TSMMark]

Hi, would it be possible to add the mount-checkout or copy-checkout option from docker-buildkite-plugin implemented here:

https://github.com/buildkite-plugins/docker-buildkite-plugin/pull/182

Or maybe this is already possible to do and undocumented? I think this would save a ton of time on certain builds

[TSMMark]

Basically I want to cp files from the host into the container, and I want to avoid docker volumes.

Any way to use docker compose cp command directly using docker-compose-buildkite-plugin? https://docs.docker.com/engine/reference/commandline/compose_cp/

[toote]

This is now part of the latest release v4.4.0 :)