add: option to select subnet

Author: xshot9011

main.tf

@@ -305,7 +305,7 @@ module "launch_template" {
 # #############################################################################
 resource "aws_autoscaling_group" "this" {
   name_prefix         = local.name
-  vpc_zone_identifier = var.private_subnet_ids
+  vpc_zone_identifier = var.is_create_public_lb || var.is_create_private_lb ? var.private_subnet_ids : var.public_subnet_ids
   desired_capacity    = 1
   max_size            = 1 #fix 1 to avoid race condition (if not move to document db for multi read/write)
   min_size            = 1