refactor(talos): make talos_machine_config_version an optional parameter

tofu/kubernetes/main.tf

@@ -26,7 +26,6 @@ module "talos" {
     # Ref: https://www.talos.dev/v1.9/talos-guides/network/vip/#requirements
     # Note This is Kubernetes API endpoint. Different from all mentions of Talos endpoints.
     endpoint                     = "192.168.1.102"
-    # Omit this if devices are not connected on layer 2
     vip                          = "192.168.1.99"
     gateway                      = "192.168.1.1"
     # The version of talos features to use in generated machine configuration. Generally the same as image version.

tofu/kubernetes/talos/config.tf

@@ -17,7 +17,9 @@ data "talos_machine_configuration" "this" {
   # This is the Kubernetes API Server endpoint.
   # ref - https://www.talos.dev/v1.9/introduction/prodnotes/#decide-the-kubernetes-endpoint
   cluster_endpoint = "https://${var.cluster.endpoint}:6443"
-  talos_version    = var.cluster.talos_machine_config_version
+  # @formatter:off
+  talos_version = var.cluster.talos_machine_config_version != null ? var.cluster.talos_machine_config_version : (each.value.update == true ? var.image.update_version : var.image.version)
+  # @formatter:on
   machine_type    = each.value.machine_type
   machine_secrets = talos_machine_secrets.this.machine_secrets
   config_patches = [

tofu/kubernetes/talos/variables.tf

@@ -20,7 +20,7 @@ variable "cluster" {
     vip = optional(string)
     gateway                      = string
     subnet_mask = optional(string, "24")
-    talos_machine_config_version = string
+    talos_machine_config_version = optional(string)
     proxmox_cluster              = string
     kubernetes_version           = string
     base_domain                  = string