Allow modification to localhost/local-dev

[qjhart]

To avoid image name collision, have localhost/${projct} be the default dev location name. Allow .cork-build and? command-line update to set to something different.

In order for local images to be found, maybe this needs to be in the .cork-build file?

{ 
  "registry": { 
    "localhost":"localhost/aggie-experts/"
    "gcb": "us-west1-docker.pkg.dev/aggie-experts/docker",
}
}

[qjhart]

alternatively, I suppose the rule could always be replace the gcb host with localhost as in localhost/aggie-experts/docker/base-service:2.2.3