The Runner interfaces with GitLab through a pretty simple API, so you could do that. One caveat is that we might introduce a new API by releasing a new version

The Runner interfaces with GitLab through a pretty simple API, so you could do that. One caveat is that we might introduce a new API by releasing a new version of GitLab and GitLab Runner at the same time, then you would need to upgrade you project to stay compatible. BTW To ensure nobody is confused, you can use GitLab Runner to test all kinds of projects on all kinds of hardware. We're discussing developing an alternative to GitLab but reusing GitLab Runner.