fix: rework domain derivation

Terraform doesn't support custom functions!

Author: azahi

google.tf

@@ -10,9 +10,6 @@ resource "google_certificate_manager_certificate" "gateway" {
 
   # Name change is required by the API specification.
   name = replace(replace(each.value.domain, "_", "-"), ".", "-")
-  labels = {
-    domain = each.value.domain
-  }
   self_managed {
     pem_certificate = each.value.certificate
     pem_private_key = each.value.key
@@ -24,10 +21,12 @@ resource "google_certificate_manager_certificate_map" "gateway" {
 }
 
 resource "google_certificate_manager_certificate_map_entry" "gateway" {
-  for_each = google_certificate_manager_certificate.gateway
+  for_each = tomap({
+    for v in var.gateway_certificates : replace(replace(v.domain, "-", "_"), ".", "_") => v
+  })
 
-  name         = each.value.name
+  name         = replace(replace(each.value.domain, "_", "-"), ".", "-")
   map          = google_certificate_manager_certificate_map.gateway.name
   certificates = [google_certificate_manager_certificate.gateway[each.key].id]
-  hostname     = each.value.labels.domain
+  hostname     = each.value.domain
 }