output "vpc_id" {
  description = "id du vpc"
  value = google_compute_network.vpc.id 
}

output "subnets" {
  description = "ids of subnets"
  value = {
    fr_id = google_compute_subnetwork.frontend.id
    ba_id = google_compute_subnetwork.backend.id
    dat_id = google_compute_subnetwork.database.id
  } 
}