[ayufan]

I understand your reasoning.

At this point it doesn't make sense to introduce support for another clustering manager. The GitLab Runner does support docker-machine (you can pretty easily configure it to create machines on-demand on any cloud provider). These machines will be pretty much self-managed. Soon the Runner will be also compatible with Docker Swarm, the implementation is already on separate branch.

From my perspective Kubernetes is great as platform for deploying applications, but I'm not so sure if it comes for distributing builds.

The problem with cleaning old images and caches is also addressed. You may be interested in checking out this application: https://gitlab.com/gitlab-org/gitlab-runner-docker-cleanup

What is important that GitLab Runner is being constantly improved and at some point with more convincing (for example coming from You) we can get back to native Kubernetes executor :)

GitLab CI Lead