Added terraform network and env configs

terraform/modules/network/main.tf

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+resource "google_compute_network" "my_vpc" {
+  name                    = "my-vpc"
+  auto_create_subnetworks = false
+}
+
+resource "google_compute_subnetwork" "frontend" {
+  name          = "frontend"
+  ip_cidr_range = var.frontend_cidr
+  region        = var.region
+  network       = google_compute_network.my_vpc.id
+}
+
+resource "google_compute_subnetwork" "backend" {
+  name          = "backend"
+  ip_cidr_range = var.backend_cidr
+  region        = var.region
+  network       = google_compute_network.my_vpc.id
+}
+
+resource "google_compute_subnetwork" "database" {
+  name          = "database"
+  ip_cidr_range = var.database_cidr
+  region        = var.region
+  network       = google_compute_network.my_vpc.id
+}
+
+resource "google_compute_firewall" "web" {
+  name       = "web"
+  network    = google_compute_network.my_vpc.id
+  allow { 
+    protocol = "tcp"
+    ports = ["80", "443"]
+  }
+}
+
+resource "google_compute_firewall" "ssh" {
+  name       = "ssh"
+  network    = google_compute_network.my_vpc.id
+  allow {
+    protocol = "tcp"
+    ports = ["22"]
+  }
+}
+
+resource "google_compute_firewall" "frontend_to_backend" {
+  name       = "frontend-to-backend"
+  network    = google_compute_network.my_vpc.id
+  allow {
+    protocol = "tcp"
+    ports = ["8000"]
+  }
+  source_ranges = [
+    google_compute_subnetwork.frontend.ip_cidr_range
+  ]
+  target_tags = ["backend"]
+}
+
+resource "google_compute_firewall" "backend_to_database" {
+  name       = "backend-to-database"
+  network    = google_compute_network.my_vpc.id
+  allow {
+    protocol = "tcp"
+    ports = ["3306"]
+  }
+  source_ranges = [
+    google_compute_subnetwork.backend.ip_cidr_range
+  ]
+  target_tags = ["db"]
+}

terraform/modules/network/outputs.tf

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+output "vpc_id" {
+  value = google_compute_network.my_vpc.id
+  description = "VPC ID"
+}
+
+output "subnet_ids" {
+  value = {
+    frontend = google_compute_subnetwork.frontend.id
+    backend  = google_compute_subnetwork.backend.id
+    database = google_compute_subnetwork.database.id
+  }
+  description = "subnetworks ids"
+}

terraform/modules/network/variables.tf

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+variable "project_name" {
+  description = "Google Cloud Project Name"
+  type        = string
+  default     = "projet-iut-44231"
+}
+
+variable "region" {
+  description = "Google Cloud Region"
+  type        = string
+  default     = "europe-west1"
+}
+
+variable "frontend_cidr" {
+  description = "Frontend subnetwork CIDR"
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "backend_cidr" {
+  description = "Backend subnetwork CIDR"
+  type        = string
+  default     = "10.0.2.0/24"
+}
+
+variable "database_cidr" {
+  description = "Database subnetwork CIDR"
+  type        = string
+  default     = "10.0.3.0/24"
+}