Configuring Blue-Green Deployments with AWS CodeDeploy and ECS Fargate

Act as a Principal Cloud Architect. Develop a flawless, zero-downtime Blue-Green deployment strategy architecture targeting AWS ECS Fargate. Generate the exact `AppSpec.yml` structure and a robust Terraform module dictating the integration between the [SERVICE_NAME] running on [CLUSTER_NAME] and AWS CodeDeploy. The deployment must mathematically govern traffic shifting, executing a linear rollout over exactly [TERMINATION_WAIT_TIME] minutes. Architect a highly sensitive rollback trigger utilizing CloudWatch Alarms monitoring 5XX HTTP errors on the target group. Explicitly describe how the [ALB_LISTENER_ARN] handles the segregated 'Test' traffic route on a secondary port (e.g., 8080) to validate the Green environment before the primary traffic swap occurs.