Add dns_servers variable for network configuration (#83)

Signed-off-by: Roman Schwarz <rs@cloudeteer.de>

Author: rswrz

README.md

@@ -421,6 +421,14 @@ list(object({
 
 Default: `[]`
 
+### <a name="input_dns_servers"></a> [dns\_servers](#input\_dns\_servers)
+
+Description: A list of DNS server IP addresses to assign to the primary network interface of the virtual machine. These servers will override the default DNS settings provided by the subnet or virtual network.
+
+Type: `list(string)`
+
+Default: `[]`
+
 ### <a name="input_domain_join"></a> [domain\_join](#input\_domain\_join)
 
 Description: Enable domain join for the virtual machine. This feature is not supported on Linux Virtual Machines.

r-network.tf

@@ -15,6 +15,8 @@ resource "azurerm_network_interface" "this" {
   resource_group_name = var.resource_group_name
   tags                = var.tags
 
+  dns_servers = var.dns_servers
+
   ip_configuration {
     name                          = "ipconfig1"
     private_ip_address            = var.private_ip_address

variables.tf

@@ -1,17 +1,16 @@
 locals {
-  windows_license_types = ["None", "Windows_Client", "Windows_Server"]
-  linux_license_types = [
-    "RHEL_BYOS", "RHEL_BASE", "RHEL_EUS", "RHEL_SAPAPPS", "RHEL_SAPHA", "RHEL_BASESAPAPPS", "RHEL_BASESAPHA",
-    "SLES_BYOS", "SLES_SAP", "SLES_HPC"
-  ]
-
   identity_type = (
     var.entra_id_login.enabled ? (
       strcontains(try(var.identity.type, ""), "UserAssigned") ?
       replace(var.identity.type, var.identity.type, "SystemAssigned, UserAssigned") :
       "SystemAssigned"
     ) :
   try(var.identity.type, null))
+  linux_license_types = [
+    "RHEL_BYOS", "RHEL_BASE", "RHEL_EUS", "RHEL_SAPAPPS", "RHEL_SAPHA", "RHEL_BASESAPAPPS", "RHEL_BASESAPHA",
+    "SLES_BYOS", "SLES_SAP", "SLES_HPC"
+  ]
+  windows_license_types = ["None", "Windows_Client", "Windows_Server"]
 }
 
 variable "additional_capabilities" {
@@ -237,6 +236,13 @@ variable "data_disks" {
   default = []
 }
 
+variable "dns_servers" {
+  description = "A list of DNS server IP addresses to assign to the primary network interface of the virtual machine. These servers will override the default DNS settings provided by the subnet or virtual network."
+
+  type    = list(string)
+  default = []
+}
+
 variable "domain_join" {
   description = <<-EOT
     Enable domain join for the virtual machine. This feature is not supported on Linux Virtual Machines.