Your company has an application deployed as a Kubernetes Deployment running in Google Kubernetes Engine (GKE) . You maintain separate clusters for development, staging, and production environments. Recently, you discovered that the team is able to deploy Docker images directly to the production cluster without first deploying and testing them in the development and staging environments. While you want to maintain the team’s deployment autonomy , you also want to enforce proper promotion flow to prevent this issue from recurring. You are looking for a Google Cloud-native solution that can be implemented quickly with minimal operational overhead . What should you do?