Working Landing Zone.

modules/linux-vm/main.tf

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+resource "google_compute_instance" "vm_hub" {
+  name           = var.name
+  machine_type   = var.machine_type
+  can_ip_forward = var.can_ip_forward
+  description    = var.description
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-12"
+    }
+  }
+
+  network_interface {
+    network    = var.network_name
+    subnetwork = var.subnet_name
+  }
+
+  metadata = {
+    ssh-keys = "${var.ssh[0].public_key} ${var.ssh[0].ssh_user}"
+  }
+}

modules/linux-vm/outputs.tf

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+output "vm_internal_ip" {
+  value = google_compute_instance.vm_hub.network_interface[0].network_ip
+}

modules/linux-vm/variables.tf

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+variable "name" {
+  description = "The name of the VM instance."
+  type        = string
+}
+
+variable "machine_type" {
+  description = "The machine type of the VM instance."
+  type        = string
+  default     = "e2-micro"
+}
+
+variable "can_ip_forward" {
+  description = "Whether the VM instance can forward IP packets."
+  type        = bool
+  default     = false
+}
+
+variable "description" {
+  description = "The description of the VM instance."
+  type        = string
+  nullable    = true
+  default     = null
+}
+
+variable "network_name" {
+  description = "The name of the network to attach the VM instance to."
+  type        = string
+}
+
+variable "subnet_name" {
+  description = "The name of the subnet to attach the VM instance to."
+  type        = string
+}
+
+variable "ssh" {
+  description = "SSH Key(s) definition"
+  type = list(object({
+    public_key = string
+    ssh_user   = string
+  }))
+}