Runner Manager
By default, GitHub Actions runners are hosted by GitHub, but it is also possible to host them on your own infrastructure, with self-hosted runners. The Runner Manager is a tool to handle the process of creating, deleting and managing the state of self-hosted runners.
It is very similar to the Actions Runner Controller (ARK) with the difference being that instead of focusing on Kubernetes (containers) as backend to host the runners, it focuses on virtual machines.