Configure Talos nodes for Longhorn storage

Add the Talos extension image and dedicated user volume configuration, point Longhorn at the mounted disk, and document rebuild and rolling-upgrade steps.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

terraform/longhorn-user-volume.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1alpha1
+kind: UserVolumeConfig
+name: longhorn
+provisioning:
+  diskSelector:
+    match: disk.dev_path == '/dev/vdb'
+  maxSize: 10GiB
+  grow: false

terraform/main.tf

@@ -54,7 +54,8 @@ data "talos_machine_configuration" "role" {
     yamlencode({
       machine = {
         install = {
-          disk = var.install_disk
+          disk  = var.install_disk
+          image = var.talos_installer_image
         }
       }
       cluster = {

terraform/talos-image-schematic.yaml

@@ -0,0 +1,5 @@
+customization:
+  systemExtensions:
+    officialExtensions:
+      - siderolabs/iscsi-tools
+      - siderolabs/util-linux-tools

terraform/terraform.tfvars.example

@@ -1,5 +1,6 @@
 cluster_name       = "home-services"
 talos_version      = "v1.14.0"
+talos_installer_image = "factory.talos.dev/metal-installer/613e1592b2da41ae5e265e8789429f22e121aab91cb4deb6bc3c0b6262961245:v1.14.0"
 kubernetes_version = "<supported-kubernetes-version>"
 cluster_endpoint   = "https://<control-plane-vip>:6443"
 install_disk       = "/dev/vda"

terraform/variables.tf

@@ -10,6 +10,12 @@ variable "talos_version" {
   default     = "v1.14.0"
 }
 
+variable "talos_installer_image" {
+  type        = string
+  description = "Talos Image Factory installer image with iscsi-tools and util-linux-tools extensions. Keep its Talos version aligned with talos_version."
+  default     = "factory.talos.dev/metal-installer/613e1592b2da41ae5e265e8789429f22e121aab91cb4deb6bc3c0b6262961245:v1.14.0"
+}
+
 variable "kubernetes_version" {
   type        = string
   description = "Kubernetes version supported by the selected Talos version."