tidy up build and make configs

[BlaineEXE]

Tidy up some minor nits now that the cloudbuild is working.

[k8s-ci-robot]

Hi @BlaineEXE. Thanks for your PR.

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[wlan0]

/ok-to-test
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[BlaineEXE]

It seems that most images with docker assume they are connected to the host's docker.sock, but that is explicitly not allowed for Prow. I think possibly the build test is best achieved by still using the gcb-docker-gcloud image but using the /buildx-entrypoint directly rather than calling make build.

[BlaineEXE]

/retest

[BlaineEXE]

/retest