feat: Add custom tags option to mig-vm-module

modules/gh-runner-mig-vm/README.md

@@ -34,6 +34,7 @@ This example shows how to deploy a MIG Self Hosted Runner with an image pre-bake
 | custom\_metadata | User provided custom metadata | `map(any)` | `{}` | no |
 | gh\_runner\_labels | GitHub runner labels to attach to the runners. Docs: https://docs.github.com/en/actions/hosting-your-own-runners/using-labels-with-self-hosted-runners | `set(string)` | `[]` | no |
 | gh\_token | Github token that is used for generating Self Hosted Runner Token | `string` | n/a | yes |
+| instance\_tags | Additional tags to add to the instances | `list(string)` | `[]` | no |
 | machine\_type | The GCP machine type to deploy | `string` | `"n1-standard-1"` | no |
 | max\_replicas | Maximum number of runner instances | `number` | `10` | no |
 | min\_replicas | Minimum number of runner instances | `number` | `2` | no |

modules/gh-runner-mig-vm/main.tf

@@ -145,9 +145,7 @@ module "mig_template" {
     }, {
     "shutdown-script" = local.shutdown_script
   }, var.custom_metadata)
-  tags = [
-    "gh-runner-vm"
-  ]
+  tags = concat(["gh-runner-vm"], var.instance_tags)
 }
 /*****************************************
   Runner MIG

modules/gh-runner-mig-vm/variables.tf

@@ -147,3 +147,9 @@ variable "cooldown_period" {
   type        = number
   default     = 60
 }
+
+variable "instance_tags" {
+  type        = list(string)
+  description = "Additional tags to add to the instances"
+  default     = []
+}