I can get the image into ECR, but the issue is Elastic Beanstalk pulling it. Will ECR Credential Helper help with that? I.e. will it be able to render something I can put in the relevant "Authentication" section in Dockerrun.aws.json ?
hmm, the EB log is not auth-related, but has "invalid reference format". I'll look into that (seems as though the image is in an array, not a string).