use cloudbuild to build container images

[aojea]

This is the canonical and supported way to build images in kubernetes

https://github.com/kubernetes/test-infra/tree/master/config/jobs/image-pushing#image-pushing-jobs

[aojea]

/assign @code-elinka @swetharepakula @gauravkghildiyal

[k8s-ci-robot]

@aojea: GitHub didn't allow me to assign the following users: gauravkghildiyal.

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In response to this:

/assign @code-elinka @swetharepakula @gauravkghildiyal

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[aojea]

reference kubernetes/test-infra#29371

[cezarygerard]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, cezarygerard

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