feat: add variable master and worker counts

infra/main.tofu

@@ -3,14 +3,10 @@
 # ------
 
 locals {
+  image          = "ubuntu/26.04"
   root_disk_size = "16GiB"
   ext_disk_size  = "16GiB"
   network_cidr   = "10.150.0.1/24"
-
-  master_count = 3
-  worker_count = 0
-
-  image = "ubuntu/26.04"
 }
 
 # ---------
@@ -46,7 +42,7 @@ resource "incus_network" "this" {
 
 module "master" {
   source = "./modules/incus_vm"
-  count  = local.master_count
+  count  = var.master_count
 
   name    = "master-${count.index}"
   project = incus_project.this.name
@@ -60,7 +56,7 @@ module "master" {
 
 module "worker" {
   source = "./modules/incus_vm"
-  count  = local.worker_count
+  count  = var.worker_count
 
   name    = "worker-${count.index}"
   project = incus_project.this.name

infra/variables.tofu

@@ -1,3 +1,17 @@
+variable "master_count" {
+  description = "The number of master nodes to provision."
+  type        = number
+  default     = 1
+  nullable    = false
+}
+
+variable "worker_count" {
+  description = "The number of worker nodes to provision."
+  type        = number
+  default     = 0
+  nullable    = false
+}
+
 variable "cpus" {
   description = "The number of CPU cores allocated to each virtual machine."
   type        = number