fix: Use the launch_template_tags on the launch template (#2957)

examples/eks_managed_node_group/main.tf

@@ -264,6 +264,12 @@ module "eks" {
         additional                         = aws_iam_policy.node_additional.arn
       }
 
+      launch_template_tags = {
+        # enable discovery of autoscaling groups by cluster-autoscaler
+        "k8s.io/cluster-autoscaler/enabled" : true,
+        "k8s.io/cluster-autoscaler/${local.name}" : "owned",
+      }
+
       tags = {
         ExtraTag = "EKS managed node group complete example"
       }

modules/eks-managed-node-group/main.tf

@@ -312,7 +312,10 @@ resource "aws_launch_template" "this" {
   user_data              = module.user_data.user_data
   vpc_security_group_ids = length(local.network_interfaces) > 0 ? [] : local.security_group_ids
 
-  tags = var.tags
+  tags = merge(
+    var.tags,
+    var.launch_template_tags,
+  )
 
   # Prevent premature access of policies by pods that
   # require permissions on create/destroy that depend on nodes