Starting today, AWS Signer container image signing and verification is available in the AWS GovCloud (US) Regions. You can now use AWS Signer, a managed signing service, to sign images in registries, such as Amazon Elastic Container Registry (ECR). You can validate that only approved images are deployed to Amazon Elastic Kubernetes Service (EKS) clusters or are in use in Amazon Elastic Container Service (ECS) clusters.
Source:: Amazon AWS