Feature/healthcheck grace fix (#7)

* doh!

* allow toggling of loadbalancing

* remove healthcheck grace period when not load balanced

Author: ghaddow

main.tf

@@ -173,7 +173,7 @@ resource "aws_ecs_service" "service" {
   launch_type                        = "FARGATE"
   deployment_minimum_healthy_percent = var.deployment_minimum_healthy_percent
   deployment_maximum_percent         = var.deployment_maximum_percent
-  health_check_grace_period_seconds  = var.health_check_grace_period_seconds
+  health_check_grace_period_seconds  = var.load_balanced ? var.health_check_grace_period_seconds : null
 
   network_configuration {
     subnets          = var.private_subnet_ids