set md5_authentication_key as optional

Author: rhariady

modules/interface/main.tf

@@ -50,7 +50,7 @@ resource "google_compute_router_peer" "peers" {
   }
 
   dynamic "md5_authentication_key" {
-    for_each = lookup(each.value, "md5_authentication_key", null) == null ? [] : [""]
+    for_each = each.value.md5_authentication_key == null ? [] : [""]
     content {
       name = each.value.md5_authentication_key.name
       key  = each.value.md5_authentication_key.key

modules/interface/variables.tf

@@ -64,10 +64,10 @@ variable "peers" {
       min_receive_interval        = optional(number)
       multiplier                  = optional(number)
     })
-    md5_authentication_key = object({
+    md5_authentication_key = optional(object({
       name = string
       key  = string
-    })
+    }))
   }))
   description = "BGP peers for this interface."
   default     = []