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Solved it with:

```aws.sdk.config.credentials = {
  accessKeyId: "test",
  secretAccessKey: "test",
};
aws.sdk.config.region = aws.config.region;```
and
```imageName: `localhost:4510/${appName}-image`,```


There is also a race condition with the first request to ECR and the `docker login`.

On the creation of a new repository, ECR in localstack starts the http server.

When using awsx to create the repository, this also impies `docker login`.  `docker login` is happening before the http server is ready and causes the failure above.

To work around, I use the aws cli to create a fake repository, to get the ECR http server running before `docker login`.