Correct answer - "The IAM permissions are wrong for the CodeBuild service" : Amazon ECR users
require permissions to call ecr:GetAuthorizationToken before they can authenticate to a registry
and push or pull any images from any Amazon ECR repository. Amazon ECR provides several managed
policies to control user access at varying levels
"The ECR repository is stale, you must delete and re-create it" - You can delete a repository
when you are done using it, stale is not a concept within ECR
"CodeBuild cannot talk to ECR because of security group issues" - A security group acts as a
virtual firewall at the instance level and its not related to pushing Docker images
"The ECS instances are misconfigured and must contain additional data in /etc/ecs/ecs.config" -
The error Authorization is an indication that there is an access issue, therefore you should not
look at your configuration first but rather permissions