waypoint up with alb.listener_arn doesn't complete

[dlundgren]

Describe the bug
When I run waypoint up with an alb.listener_arn set, the ECS service says Created, but it's not attached to the Target group, and reports that the transport is closing.

» Deploying...
✓ Found existing ECS cluster: test-cluster
✓ Found existing IAM role to use: test-task-role
✓ Created ALB target group
✓ Modified ALB Listener to introduce target group
✓ Configured security group: ruby-test-inbound-internal
✓ Created ECS Service (ruby-test-T2Z7E5EV9BAD6R24EK2QWQ, cluster-name: test-cluster)
! transport is closing

Steps to Reproduce

project = "ruby-test"

app "ruby-test" {
  labels = {
    "service" = "ruby-test",
    "env" = "dev"
  }

  build {
    use "pack" {}
    registry {
      use "aws-ecr" {
        region = "us-west-1"
        repository = "tests"
        tag = "latest"
      }
    }
  }

  deploy {
    use "aws-ecs" {
      region = "us-west-1"
      memory = "512"
      cluster = "test-cluster"
      # provided by Ops
      log_group = "ruby-test"
      role_name = "test-task-role"
      alb {
        listener_arn = "arn:aws:elasticloadbalancing:us-west-1:123456789101:listener/app/ruby-test/93b4510da291c4cb/b79c7e5fc37f9c8a"
        domain_name = ""
        zone_id = ""
        certificate = ""
      }
      subnets = [
        "subnet-afef18a51f44bb9b2",
        "subnet-e1e1611bfa8e27f45"
      ]
    }
  }
}

Expected behavior
That the deploy will work properly