Adding simple cloudbuild file that builds, tags, and pushes the docker image

[kfswain]

No description provided.

[kfswain]

Pairs with: kubernetes/test-infra#33930

[kfswain]

Fixes #55

[ahg-g]

fyi, lws and jobset are slightly different: https://github.com/kubernetes-sigs/lws/blob/main/cloudbuild.yaml

not an expert on this file, so I am not sure if we need to do the same thing here.

[kfswain]

Yeah, they are using make as their build command. We are just using a simple docker build for now, so we are using a base image. I expect we will increase in sophistication as time goes on but this works for now I think. I've tested this on my personal GCP project's cloud build (I had to change the registry, but thats just permissioning issues)

[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

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