Creating resources in a loop with dynamic values

Terraform
4

I ended up with the following solution, which is exactly what I wanted, thank you so much @stuart-c !

locals  {
  instances = merge(
    {
      for id, info in var.runner_managers : "${var.runner_type}-runners-manager-${id}-blue" => info
      if var.deployment.blue
    },
    {
      for id, info in var.runner_managers : "${var.runner_type}-runners-manager-${id}-green" => info
      if var.deployment.green
    }
  )
}

resource "google_compute_instance_from_template" "runners_manager" {
  for_each = local.runners_manager.instances

  name = each.key
  zone = each.value.zone
}

Other resources I used to help me figure this out: