devcontainer: support docker-compose

[johnstcn]

Devcontainer spec supports specifying a compose file

e.g.

	"dockerComposeFile": "docker-compose.yml",

Example: https://github.com/BrunoQuaresma/openticket/blob/main/.devcontainer/devcontainer.json

[jasclarke24]

This would be an awesome feature. We run a lot of dev environments with multiple containers for testing and rapid integration. What is the recommended way of doing this now, multiple containers in the template?

[johnstcn]

What is the recommended way of doing this now, multiple containers in the template?

Yeah that's honestly the best way right now. We're working on an alternative method of using devcontainers that should more seamlessly enable using @devcontainers/cli or similar existing Devcontainer tooling.