How to define an ECR Lifecycle Policy with CloudFormation

Question

In order to limit the number of images in a repository, I'd like to define a Lifecycle policy. Since all the stack is defined with CloudFormation, I'd like to define this policy too.

For example, my policy could be "keep only the most recent 8 images, no matter if tagged or not".

Answer 1

The solution was pretty easy, but since I could not find any example or similar questions (ECR is not mainstream, I know), let me post here the easy solution that I found, which simply requires to insert the policy as JSON into the CloudFormation definition:

MyRepository:
  Type: AWS::ECR::Repository
  Properties:
    LifecyclePolicy:
      LifecyclePolicyText: |
        {
          "rules": [
          {
            "rulePriority": 1,
            "description": "Only keep 8 images",
            "selection": {
              "tagStatus": "any",
              "countType": "imageCountMoreThan",
              "countNumber": 8
            },
            "action": { "type": "expire" }
          }]
        }

Of course this is very simplistic, but it's the starting point that I was looking for