Add deployment circuit breaker

Prevents failed ECS task deployments from continuously failing and requiring manual intervention to resolve.

Signed-off-by: Brian Herrera <briher@amazon.com>

cdk/jenkins_server/jenkins_server.py

@@ -179,7 +179,8 @@ def _create_ecs(self):
             assign_public_ip=True,
             platform_version=ecs.FargatePlatformVersion.VERSION1_4,
             cluster=cluster,
-            desired_count=ecs_config['service']['desired_count']
+            desired_count=ecs_config['service']['desired_count'],
+            circuit_breaker=ecs.DeploymentCircuitBreaker(rollback=True)
         )
 
         self.file_system.connections.allow_default_port_from(fargate_service)