Support docker-compose 2.x

[candidtim]

docker-compose 2.x changed the naming convention for containers: it uses dash - to separate the project and container names, instead of underscore _ that was used in 1.x. As a consequence, getDockerContainerId cannot find the containers because it assume the older naming convention.

This is a proposal to support both naming conventions, probably using a flag to switch between the two.

Relevant code from "docker compose":
https://github.com/docker/compose/blob/0062703bea796eca5b5f78a4779fa166cc18619c/pkg/compose/compose.go#L36

[serhiip]

My attempt to fix this issue is in PR #125

[dakaneye]

Second this fix, it's blocking my ability to use this plugin! PR has been open since August...

[bcarter97]

As a workaround you can either export COMPOSE_COMPATIBILITY=true in your bash profile or disable V2 in the Docker settings.