Adds docker-compose and nodejs to the offcial docker image.
Can be used as a runner in GitLab like this:
docker exec -it gitlab-runner \
gitlab-runner \
register -n \
--name "docker-node" \
--tag-list "docker-node" \
--docker-image "colinhan/docker-compose-with-node:latest" \
--docker-privileged \
--docker-volumes "/var/run/docker.sock:/var/run/docker.sock" \
--docker-volumes "/cache"