cloudbuild: use --load flag to allow pushing images

[BlaineEXE]

The cloud build uses the docker-container driver which does not make build images available in the local image store by default -- only in the cache. This means the cloud build process doesn't see the images in order to push them at the end. Use the --load flag to fix this.

See: https://docs.docker.com/build/drivers/docker-container/#loading-to-local-image-store

[k8s-ci-robot]

Hi @BlaineEXE. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[wlan0]

/ok-to-test

[wlan0]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[wlan0]

/lgtm