feat: allow setting VPC and subnets per runner (#3467)

This allows passing in a different VPC and subnet IDs for each runner
config and falling back to the "global" value set via the existing
`vpc_id` and `subnet_ids` variables.

---------

Co-authored-by: Niek Palm <[email protected]>

Author: taharah

.terraform.lock.hcl

@@ -3,7 +3,27 @@ locals {
   aws_region  = "eu-west-1"
 
   # Load runner configurations from Yaml files
-  multi_runner_config = { for c in fileset("${path.module}/templates/runner-configs", "*.yaml") : trimsuffix(c, ".yaml") => yamldecode(file("${path.module}/templates/runner-configs/${c}")) }
+  multi_runner_config_files = {
+    for c in fileset("${path.module}/templates/runner-configs", "*.yaml") :
+
+    trimsuffix(c, ".yaml") => yamldecode(file("${path.module}/templates/runner-configs/${c}"))
+  }
+  multi_runner_config = {
+    for k, v in local.multi_runner_config_files :
+
+    k => merge(
+      v,
+      {
+        runner_config = merge(
+          v.runner_config,
+          {
+            subnet_ids = lookup(v.runner_config, "subnet_ids", null) != null ? [module.base.vpc.private_subnets[0]] : null
+            vpc_id     = lookup(v.runner_config, "vpc_id", null) != null ? module.base.vpc.vpc_id : null
+          }
+        )
+      }
+    )
+  }
 }
 
 resource "random_id" "random" {

examples/arm64/.terraform.lock.hcl

@@ -9,6 +9,8 @@ runner_config:
   runner_architecture: x64
   runner_name_prefix: amazon-x64_
   enable_ssm_on_runners: true
+  vpc_id: ${vpc_id}
+  subnet_ids: ${subnet_ids}
   instance_types:
     - m5ad.large
     - m5a.large