[CI] Specify runner group per cluster

This patch specifies the runner group that a runner scale set is associated
with specifically per cluster rather than just using the default runner group.
This is a requirement for setting up a HA cluster. The runner scale sets need
to be named the same but in different groups so that they do not conflict.

Author: boomanaiden154

premerge/linux_runners_values.yaml

@@ -4,6 +4,8 @@ githubConfigSecret: "github-token"
 minRunners: 0
 maxRunners: 8
 
+runnerGroup: ${ runner_group_name }
+
 template:
   metadata:
     annotations:

premerge/main.tf

@@ -135,6 +135,7 @@ module "premerge_cluster_resources" {
   github_app_private_key     = data.google_secret_manager_secret_version.github_app_private_key.secret_data
   cluster_name               = "llvm-premerge-prototype"
   grafana_token              = data.google_secret_manager_secret_version.grafana_token.secret_data
+  runner_group_name          = "llvm-premerge-cluster-us-central"
   providers = {
     kubernetes = kubernetes.llvm-premerge-us-central
     helm       = helm.llvm-premerge-us-central
@@ -148,6 +149,7 @@ module "premerge_cluster_resources2" {
   github_app_private_key     = data.google_secret_manager_secret_version.github_app_private_key.secret_data
   cluster_name               = "llvm-premerge-cluster-us-west"
   grafana_token              = data.google_secret_manager_secret_version.grafana_token.secret_data
+  runner_group_name          = "llvm-premerge-cluster-us-west"
   providers = {
     kubernetes = kubernetes.llvm-premerge-us-west
     helm       = helm.llvm-premerge-us-west

premerge/premerge_resources/main.tf

@@ -83,7 +83,7 @@ resource "helm_release" "github_actions_runner_set_linux" {
   chart      = "gha-runner-scale-set"
 
   values = [
-    "${file("linux_runners_values.yaml")}"
+    "${templatefile("linux_runners_values.yaml", { runner_group_name : var.runner_group_name })}"
   ]
 
   depends_on = [
@@ -101,7 +101,7 @@ resource "helm_release" "github_actions_runner_set_windows" {
   chart      = "gha-runner-scale-set"
 
   values = [
-    "${file("windows_runner_values.yaml")}"
+    "${templatefile("windows_runner_values.yaml", { runner_group_name : var.runner_group_name })}"
   ]
 
   depends_on = [

premerge/premerge_resources/variables.tf

@@ -50,3 +50,7 @@ variable "externalservices_tempo_basicauth_username" {
   type    = number
   default = 952165
 }
+
+variable "runner_group_name" {
+  type = string
+}

premerge/windows_runner_values.yaml

@@ -4,6 +4,8 @@ githubConfigSecret: "github-token"
 minRunners: 0
 maxRunners: 16
 
+runnerGroup: ${ runner_group_name }
+
 template:
   metadata:
     annotations: