build kind images automatically

[aojea]

let the machines work for us

[k8s-ci-robot]

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[aojea]

@BenTheElder this can be triggered by an event or manually (right now is set to only manual),
we can also push to an intermediate registry if we don't want to publish it to dockerhub directly
You have a run example here https://github.com/aojea/kind/runs/3055037619?check_suite_focus=true
thoughts?

[BenTheElder]

we can also push to an intermediate registry if we don't want to publish it to dockerhub directly

https://github.com/kubernetes/k8s.io/tree/main/k8s.gcr.io

https://github.com/kubernetes/test-infra/tree/master/images/builder

[aojea]

I don't have clear how substitutions work
@BenTheElder check if this works kubernetes/test-infra#22986