Create a Compute Engine instance with a dedicated service account

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resource "google_service_account" "default" {
  account_id   = "service-account-id"
  display_name = "Service Account"
}

resource "google_compute_instance" "default" {
  name         = "my-test-vm"
  machine_type = "n1-standard-1"
  zone         = "us-central1-a"

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

  // Local SSD disk
  scratch_disk {
    interface = "SCSI"
  }

  network_interface {
    network = "default"

    access_config {
      // Ephemeral public IP
    }
  }

  service_account {
    # Google recommends custom service accounts with `cloud-platform` scope with
    # specific permissions granted via IAM Roles.
    # This approach lets you avoid embedding secret keys or user credentials
    # in your instance, image, or app code
    email  = google_service_account.default.email
    scopes = ["cloud-platform"]
  }
}