$ vim instance.tf
resource "google_compute_instance" "gcp-vm-01" {
  name         = "gcp-vm-01"
  machine_type = "e2-small"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }

  network_interface {
    subnetwork = google_compute_subnetwork.subnetwork_external_dual.self_link
    stack_type = "IPV4_IPV6"

    access_config {
      network_tier = "PREMIUM"
    }

    ipv6_access_config {
      network_tier = "PREMIUM"
    }

  }
  allow_stopping_for_update = true
}