Can I use the Amazon EC2 Container Registry (ECR) with the built-in Bamboo Docker task?

Yes, Atlassian's built-in Bamboo Docker task supports pushing an image to a custom Docker registry such as the Amazon EC2 Container Registry (ECR), and enabling the built-in Bamboo Docker task to push images to an Amazon ECR repository has been the triggering use case for the Amazon ECR Credentials Variables task – refer to How to push a Docker image to a repository in your Amazon ECR registry with the Bamboo Docker task for details.