Added push to Cloudbuild.yaml and swapped out quay.io with gcr repo

[aarongalang]

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[k8s-ci-robot]

Hi @aarongalang. Thanks for your PR.

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[wlan0]

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aarongalang, wlan0

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