Migrate to Artifact Registry

[upodroid]

Google Container Registry has been recommending migrating to Artifact Registry for some time now.

https://cloud.google.com/artifact-registry/docs/transition/transition-from-gcr

In theory, this should be straight forward:

• Ensure all service accounts have been granted Artifact Registry roles
• One major change is that repositories need to be created.
• Authentication methods are still the same.

gcr.io will be replaced by us-docker.pkg.dev

#3004 introduces the new repository in to the Prow build images.

[chizhg]

Thanks for opening this!

[github-actions]

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[chizhg]

/lifecycle frozen

[dprotaso]

Hey @upodroid is #3004 the only thing we need to do here?

cc @kvmware

[upodroid]

So #3004 configures the docker cred helper. We need to change the KO_DOCKER_REPO env value to use Artifact Registry and I haven't investigated that work.