I love the lightweight approach with GitLab CI, it's really easy to get started with. I currently don't miss any significant functionality, but I guess our builds are not that complex.
As we're running our complete infrastructure on Mesos/Marathon, I wonder whether it'd be possible to use the new autoscaling for the runners with Marathon instead of docker-machine. Basically, the only thing I'd need to be able to is to retrieve the registration token for the runners via a API, so that it can be passed in when the new Docker container(s) is/are spun up.
Currently (we're still using the old runner version in a custom Docker image, https://hub.docker.com/r/tobilg/gitlab-runner/), we scale them manually via Marathon.
Probably it's easy to integrate Mesos/Marathon additionally to docker-machine, because the mechanism for scaling seem to be the same.
I think this will be beneficial to Mesos users, bescause it will be very easy to use and scale GitLab on it.
