Expose docker compose file to mutate

[davidfowl]

See #8844 (comment)

We should expose a first class method to allow setting the default network name on the new DockerComposeEnvironment resource.

With @captainsafia's changes here #8828 we create a docker compose resource that we allow users to mutate via a callback. We can do the same for the compose file via the DockerComposeEnvironment resource.

We should also consider exposing the environment variables (.env file).

[davidfowl]

@captainsafia as part of these changes we should associate the compose file with the environment itself.