Proposal: Kubernetes Build Plugin

We propose that a build plugin and corresponding framework be added to kubernetes to facilitate: 

1. Leveraging Kubernetes' scheduling, resource allocation, and garbage collection in order to provide docker image build capabilities to users
2. Third party systems wishing to use OTS Kubernetes as a build-farm
3. Organizations using a third-party CI server to orchestrate docker image builds as part of their devops SOPs
The name would be composed of the build id and a predefined prefix. If the build id is unique, the name should also be unique. We could also rely on additional tags on the pod to associate it with a particular build.