updating modules

modules/container_app/dns.tf

@@ -0,0 +1,19 @@
+data "azurerm_dns_zone" "dns_zone" {
+  name = var.domain_name
+}
+
+data "azurerm_resource_group" "dns_zone_resource_group" {
+  name = var.dns_zone_resource_group
+}
+
+resource "azurerm_dns_txt_record" "dns_txt_record" {
+  count = var.custom_domain_count
+  name = "asuid.${var.app_subdomain_name}"
+  resource_group_name = data.azurerm_resource_group.dns_zone_resource_group.name
+  zone_name = data.azurerm_dns_zone.dns_zone.name
+  ttl = 14400
+
+  record {
+    value = azurerm_container_app.container_app_app.custom_domain_verification_id
+  }
+}