variables.tf: add the 'gcp_arm64_worker_image_name' variable

This change is related to
antmicro/runner@bb5f729

Author: AdamOlech

README.md

@@ -88,6 +88,7 @@ No modules.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_gcp_arm64_worker_image_name"></a> [gcp\_arm64\_worker\_image\_name](#input\_gcp\_arm64\_worker\_image\_name) | Name of the image used for worker instances (ARM64) | `string` | `""` | no |
 | <a name="input_gcp_auxiliary_zones"></a> [gcp\_auxiliary\_zones](#input\_gcp\_auxiliary\_zones) | A list of zones where workers can be spawned in case of home zone resource exhaustion (beta) | `list(any)` | `[]` | no |
 | <a name="input_gcp_coordinator_disk_image"></a> [gcp\_coordinator\_disk\_image](#input\_gcp\_coordinator\_disk\_image) | Name of the image to use for coordinator boot disk | `string` | `"projects/debian-cloud/global/images/debian-10-buster-v20210512"` | no |
 | <a name="input_gcp_coordinator_disk_name_prefix"></a> [gcp\_coordinator\_disk\_name\_prefix](#input\_gcp\_coordinator\_disk\_name\_prefix) | Defaults to instance name if not specified. | `string` | `null` | no |

main.tf

@@ -286,8 +286,9 @@ resource "google_compute_instance" "gha-coordinator" {
   }
 
   metadata = {
-    SCALE        = var.gcp_coordinator_scale > 0 ? var.gcp_coordinator_scale : null
-    WORKER_IMAGE = var.gcp_worker_image_name != "" ? var.gcp_worker_image_name : null
+    SCALE              = var.gcp_coordinator_scale > 0 ? var.gcp_coordinator_scale : null
+    WORKER_IMAGE       = var.gcp_worker_image_name != "" ? var.gcp_worker_image_name : null
+    WORKER_IMAGE_ARM64 = var.gcp_arm64_worker_image_name != "" ? var.gcp_arm64_worker_image_name : null
   }
 
   deletion_protection = true

variables.tf

@@ -119,6 +119,12 @@ variable "gcp_worker_image_name" {
   default     = ""
 }
 
+variable "gcp_arm64_worker_image_name" {
+  type        = string
+  description = "Name of the image used for worker instances (ARM64)"
+  default     = ""
+}
+
 variable "gcp_vpc_ipv6" {
   type        = bool
   description = "Enable external IPv6 access for worker machines"