Add support for nginx streams

terraform/modules/apps/coredns/variables.tf

@@ -36,3 +36,9 @@ variable "zones" {
   }))
   default = []
 }
+
+variable "external_dns_enabled" {
+  description = "Enable listening on port 53 on the loadbalancer for external DNS resolution"
+  type        = bool
+  default     = false
+}