In GitLab CI you can use any machine for a build as long a you can install GitLab Runner on it. We kept the design of that simple with few dependencies and it is written in Go.
So, you're saying that you can use tags [0] to specify that a runner has some special hardware like GPUs. Then in the project set a job to only run on a runner with those tags [1].
We just don't use gitlab heavily enough yet :). We are mainly a JVM shop so the bias jenkins has for things like maven and what not out of the box is pretty appealing. I've been watching your integration play :). Maybe 1 day.
