How do I deploy an ECS Fargate service with an ALB?
I'm trying to configure the [ecs-service module](https://github.com/gruntwork-io/terraform-aws-ecs/tree/master/modules/ecs-service) in Fargate mode that is linked to an ALB. I have figured out the variable configuration for setting up the service to deploy in Fargate mode, but I am struggling to figure out what variables I need to configure to link it to an ALB. Which variables should I configure? NOTE: I already tried copying the `ecs-service` module block from the [docker-fargate-service-with-alb](https://github.com/gruntwork-io/terraform-aws-ecs/tree/master/examples/docker-fargate-service-with-alb), but I am getting the following error: ``` Error: failed creating ECS service (SERVICE_NAME): InvalidParameterException: The target group with targetGroupArn arn:aws:elasticloadbalancing:eu-west-1:xxxxxxxxx:targetgroup/SERVICE_NAME/c5717e184d65dcf7 does not have an associated load balancer ```
Hi, without `ecs-service` definition is not clear how which variables got passed to module, but should be set [`elb_target_groups`](https://github.com/gruntwork-io/terraform-aws-ecs/blob/master/examples/docker-fargate-service-with-alb/main.tf#L68) on `ecs-service` which should reference [`alb`](https://github.com/gruntwork-io/terraform-aws-ecs/blob/master/examples/docker-fargate-service-with-alb/main.tf#L155)