variable "instance_type" { description = "Type de machine GCP" type = string } variable "zone" { description = "Zone de déploiement" type = string } variable "frontend_subnet_id" { description = "ID du subnet pour l’instance frontend" type = string } variable "backend_subnet_id" { description = "ID du subnet pour l’instance backend" type = string } variable "database_subnet_id" { description = "ID du subnet pour l’instance database" type = string }