image_tag_mutability
Different values to define the image tag mutability. You can configure a repository to enable tag mutability to prevent image tags from being overwritten. After the repository is configured for immutable tags, an ImageTagAlreadyExistsException error is returned if you attempt to push an image with a tag that is already in the repository. When tag immutability is enabled for a repository, this affects all tags and you cannot make some tags immutable while others aren't.
See
https://docs.aws.amazon.com/AmazonECR/latest/userguide/image-tag-mutability.html
Values
• IMMUTABLE = IMMUTABLE
• MUTABLE = MUTABLE