When deleting an ECR repository using the SDK or CLI there's a force option which will delete the repository regardless if there images in the repository. Please support this option, otherwise users are forced to use a custom resource as a workaround.

For reference, see:

1. https://docs.aws.amazon.com/cli/latest/reference/ecr/delete-repository.html
2. https://docs.aws.amazon.com/AmazonECR/latest/APIReference/API_DeleteRepository.html