The CDK App is also code, so it must be versioned like application code. To do that, we’ll store the CDK code in a code repository like Git or CodeCommit. And based on this, you can assume this repository as Single Source of Truth as you do in GitOps, manage the code and deploy automatically.
Native support for CI / CD functionality for CDK code is posted on the [Roadmap] (https://github.com/orgs/aws/projects/7#card-28147397) as of May 2020. Until this feature gets GA, you can write a pipeline that deploy the CDK application into multiple regions in a GitOps fashion. You can find a reference at this github. .