add minikube bootcamp image to registry

[ComradeProgrammer]

Following https://github.com/kubernetes/test-infra/blob/master/config/jobs/image-pushing/README.md
Changes are also being made simultaneously on minikube side kubernetes/minikube#21904
(There will be a file called hack/prow/image/kubernetes-bootcamp/cloudbuild.yaml in minikube)

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[ComradeProgrammer]

We are trying to migrate some simple image to k8s registry, so we just chose the easiest one. If this works, we will migrate more of them.

[medyagh]

/lgtm

[ameukam]

Suggested change

	- --project=k8s-staging-minikube
	- --project=k8s-staging-images

to match https://github.com/kubernetes/k8s.io/blob/main/infra/gcp/terraform/k8s-staging-images/registries.tf#L42

[ameukam]

Suggested change

	- --scratch-bucket=gs://k8s-staging-minikube-gcb
	- --scratch-bucket=gs://k8s-staging-images-gcb

[BenTheElder]

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