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modules/backend/variables.tf

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+variable "project_id" {
+  type        = string
+  description = "The ID of the Google Cloud project to use for resources."
+}
+
+variable "region" {
+  type        = string
+  description = "The region to create resources in."
+}
+
+variable "sa_email" {
+  type        = string
+  description = "The email address of the service account to associate with the instance."
+}
+
+variable "image_name" {
+  type        = string
+  description = "The name of the image to use for the instance boot disk."
+}