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Hi, I’m trying to use `@pulumi/docker` to build an image which is subsequently used for a k8s deployment. The image shall be pushed to a private GCR registry. This is a subset of my current code:
```
const imageName = 'prediction-container-manager-router';

const image = docker.buildAndPushImage(
  'solvvy-dev/prediction-container-manager-router',
  {
    context: './router',
    dockerfile: './router/Dockerfile'
  },
  'solvvy-dev/prediction-container-manager-router',
  null,
  async () =&gt; ({
    registry: '<http://gcr.io|gcr.io>',
    username: 'oauth2accesstoken',
    password: execSync('gcloud auth print-access-token').toString('utf8')
  })
);
```

Pulumi up fails with
```
    logging in to registry...

  pulumi:pulumi:Stack: prediction-container-manager-prediction-container-manager-api-cluster-dev-b
    info: denied: requested access to the resource is denied
    error: [runtime] Docker push of image 'solvvy-dev/prediction-container-manager-router' failed with exit code: 1
```

which is not a very helpful error. Is there some example of how to use gcr? Also what should I pass as `logResource` / the forth parameter of docker.buildAndPushImage to perhaps get some more useful log output? Currently I’m just passing `null`.