Add auto-delete boot disk as an option on vm-instance

modules/compute/vm-instance/README.md

@@ -134,6 +134,7 @@ No modules.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_auto_delete_boot_disk"></a> [auto\_delete\_boot\_disk](#input\_auto\_delete\_boot\_disk) | Controlls if boot disk should be auto-deleted when instance is deleted. | `bool` | `true` | no |
 | <a name="input_bandwidth_tier"></a> [bandwidth\_tier](#input\_bandwidth\_tier) | Tier 1 bandwidth increases the maximum egress bandwidth for VMs.<br>  Using the `tier_1_enabled` setting will enable both gVNIC and TIER\_1 higher bandwidth networking.<br>  Using the `gvnic_enabled` setting will only enable gVNIC and will not enable TIER\_1.<br>  Note that TIER\_1 only works with specific machine families & shapes and must be using an image that supports gVNIC. See [official docs](https://cloud.google.com/compute/docs/networking/configure-vm-with-high-bandwidth-configuration) for more details. | `string` | `"not_enabled"` | no |
 | <a name="input_deployment_name"></a> [deployment\_name](#input\_deployment\_name) | Name of the deployment, used to name the cluster | `string` | n/a | yes |
 | <a name="input_disable_public_ips"></a> [disable\_public\_ips](#input\_disable\_public\_ips) | If set to true, instances will not have public IPs | `bool` | `false` | no |

modules/compute/vm-instance/main.tf

@@ -112,7 +112,7 @@ resource "google_compute_instance" "compute_vm" {
   boot_disk {
     source      = google_compute_disk.boot_disk[count.index].self_link
     device_name = google_compute_disk.boot_disk[count.index].name
-    auto_delete = true
+    auto_delete = var.auto_delete_boot_disk
   }
 
   dynamic "scratch_disk" {

modules/compute/vm-instance/variables.tf

@@ -49,6 +49,12 @@ variable "disk_type" {
   default     = "pd-standard"
 }
 
+variable "auto_delete_boot_disk" {
+  description = "Controlls if boot disk should be auto-deleted when instance is deleted."
+  type        = bool
+  default     = true
+}
+
 variable "local_ssd_count" {
   description = "The number of local SSDs to attach to each VM. See https://cloud.google.com/compute/docs/disks/local-ssd."
   type        = number