Add ci postsubmit script for pushing images to staging

[justinsb]

This is the GCB script that will be called to automatically push images to our staging repo from a prow postsubmit job. That job is kubernetes/test-infra#14503

[k8s-ci-robot]

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[justinsb]

/retest

[justinsb]

/test pull-kops-e2e-kubernetes-aws

[rifelpet]

Looking at the kops-controller-push make target, does KOPS_CONTROLLER_TAG need to be defined?

kops/Makefile

Line 916 in bb36e26

DOCKER_REGISTRY=${DOCKER_REGISTRY} DOCKER_IMAGE_PREFIX=${DOCKER_IMAGE_PREFIX} KOPS_CONTROLLER_TAG=${KOPS_CONTROLLER_TAG} bazel run //cmd/kops-controller:push-image

[rifelpet]

/test pull-kops-verify-generated

[rifelpet]

I'm not fully sure how this will work but because its a new CI job that shouldnt affect anything else...

/lgtm

[k8s-ci-robot]

@justinsb: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kops-e2e-kubernetes-aws	ebcb776	link	/test pull-kops-e2e-kubernetes-aws

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