Provide a dev-test workflow for Kubernetes contributors

[itowlson]

Kind is great for testing tooling and applications against different versions of k8s, but it looks like another significant use case is testing Kubernetes custom builds, for example as part of contributing to k8s upstream. Can we provide a smooth optimised workflow around kind build node-image and kind create cluster for a k8s contributor to quickly spin up a cluster based on their current working copy? Or is this a silly idea?