solution

backend.tf

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+terraform {
+  backend "azurerm" {
+    resource_group_name   = "mate-azure-task-12"
+    storage_account_name  = "yourstorageaccount"
+    container_name        = "tfstate"
+    key                   = "terraform.tfstate"
+  }
+}

main.tf

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+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "main" {
+  name     = var.resource_group_name
+  location = var.location
+}
+
+module "network" {
+  source                      = "./modules/network"
+  location                    = var.location
+  resource_group_name         = azurerm_resource_group.main.name
+  virtual_network_name        = var.virtual_network_name
+  vnet_address_prefix         = var.vnet_address_prefix
+  subnet_name                 = var.subnet_name
+  subnet_address_prefix       = var.subnet_address_prefix
+  network_security_group_name = var.network_security_group_name
+  public_ip_address_name      = var.public_ip_address_name
+  dns_label                   = var.dns_label
+}
+
+module "compute" {
+  source              = "./modules/compute"
+  location            = var.location
+  resource_group_name = azurerm_resource_group.main.name
+  subnet_id           = module.network.subnet_id
+  public_ip_id        = module.network.public_ip_id
+  vm_name             = var.vm_name
+  vm_size             = var.vm_size
+  ssh_key_public      = var.ssh_key_public
+}
+
+module "storage" {
+  source               = "./modules/storage"
+  location             = var.location
+  resource_group_name  = azurerm_resource_group.main.name
+  storage_account_name = "stor${random_integer.rand.result}"
+}
+
+resource "random_integer" "rand" {
+  min = 1000
+  max = 9999
+}

modules/compute/main.tf

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+resource "azurerm_network_interface" "this" {
+  name                = "${var.vm_name}-nic"
+  location            = var.location
+  resource_group_name = var.resource_group_name
+
+  ip_configuration {
+    name                          = "internal"
+    subnet_id                     = var.subnet_id
+    private_ip_address_allocation = "Dynamic"
+    public_ip_address_id          = var.public_ip_id
+  }
+}
+
+resource "azurerm_linux_virtual_machine" "this" {
+  name                = var.vm_name
+  location            = var.location
+  resource_group_name = var.resource_group_name
+  size                = var.vm_size
+  admin_username      = "azureuser"
+
+  network_interface_ids = [azurerm_network_interface.this.id]
+
+  admin_ssh_key {
+    username   = "azureuser"
+    public_key = var.ssh_key_public
+  }
+
+  os_disk {
+    caching              = "ReadWrite"
+    storage_account_type = "Standard_LRS"
+  }
+
+  source_image_reference {
+    publisher = "Canonical"
+    offer     = "0001-com-ubuntu-server-jammy"
+    sku       = "22_04-lts"
+    version   = "latest"
+  }
+}
+
+# VM Extension to deploy ToDo app
+resource "azurerm_virtual_machine_extension" "install_app" {
+  name                 = "install-app"
+  virtual_machine_id   = azurerm_linux_virtual_machine.this.id
+  publisher            = "Microsoft.Azure.Extensions"
+  type                 = "CustomScript"
+  type_handler_version = "2.1"
+
+  settings = <<SETTINGS
+    {
+      "fileUris": ["https://raw.githubusercontent.com/chornoknysh/devops_todolist_terraform_task/main/install-app.sh"],
+      "commandToExecute": "bash install-app.sh"
+    }
+  SETTINGS
+}

modules/compute/outputs.tf

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+output "vm_id" {
+  value = azurerm_linux_virtual_machine.this.id
+}

modules/compute/variables.tf

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+variable "location" {}
+variable "resource_group_name" {}
+variable "subnet_id" {}
+variable "public_ip_id" {}
+variable "vm_name" {}
+variable "vm_size" {}
+variable "ssh_key_public" {}

modules/network/main.tf

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+resource "azurerm_virtual_network" "this" {
+  name                = var.virtual_network_name
+  address_space       = [var.vnet_address_prefix]
+  location            = var.location
+  resource_group_name = var.resource_group_name
+}
+
+resource "azurerm_subnet" "this" {
+  name                 = var.subnet_name
+  resource_group_name  = var.resource_group_name
+  virtual_network_name = azurerm_virtual_network.this.name
+  address_prefixes     = [var.subnet_address_prefix]
+}
+
+resource "azurerm_network_security_group" "this" {
+  name                = var.network_security_group_name
+  location            = var.location
+  resource_group_name = var.resource_group_name
+}
+
+resource "azurerm_public_ip" "this" {
+  name                = var.public_ip_address_name
+  location            = var.location
+  resource_group_name = var.resource_group_name
+  allocation_method   = "Dynamic"
+  domain_name_label   = "${var.dns_label}${random_integer.rand.result}"
+}
+
+resource "random_integer" "rand" {
+  min = 1000
+  max = 9999
+}

modules/network/outputs.tf

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+output "subnet_id" {
+  value = azurerm_subnet.this.id
+}
+
+output "public_ip_id" {
+  value = azurerm_public_ip.this.id
+}
+
+output "nsg_id" {
+  value = azurerm_network_security_group.this.id
+}

modules/network/variables.tf

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+variable "location" {}
+variable "resource_group_name" {}
+variable "virtual_network_name" {}
+variable "vnet_address_prefix" {}
+variable "subnet_name" {}
+variable "subnet_address_prefix" {}
+variable "network_security_group_name" {}
+variable "public_ip_address_name" {}
+variable "dns_label" {}

modules/storage/main.tf

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+resource "azurerm_storage_account" "this" {
+  name                     = var.storage_account_name
+  resource_group_name      = var.resource_group_name
+  location                 = var.location
+  account_tier             = "Standard"
+  account_replication_type = "LRS"
+}
+
+resource "azurerm_storage_container" "this" {
+  name                  = "task-artifacts"
+  storage_account_name  = azurerm_storage_account.this.name
+  container_access_type = "private"
+}

modules/storage/outputs.tf

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+output "storage_account_id" {
+  value = azurerm_storage_account.this.id
+}

modules/storage/variables.tf

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+variable "location" {}
+variable "resource_group_name" {}
+variable "storage_account_name" {}

terraform.tfvars

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+location                  = "uksouth"
+resource_group_name       = "mate-azure-task-12"
+virtual_network_name      = "vnet"
+vnet_address_prefix       = "10.0.0.0/16"
+subnet_name               = "default"
+subnet_address_prefix     = "10.0.0.0/24"
+network_security_group_name = "defaultnsg"
+public_ip_address_name    = "linuxboxpip"
+vm_name                   = "matebox"
+vm_size                   = "Standard_B1s"
+ssh_key_public            = "ssh-rsa AAAAB3Nz...yourkey"
+dns_label                 = "matetask"

variables.tf

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+variable "location" {
+  default = "uksouth"
+}
+
+variable "resource_group_name" {
+  default = "mate-azure-task-12"
+}
+
+variable "virtual_network_name" {
+  default = "vnet"
+}
+
+variable "vnet_address_prefix" {
+  default = "10.0.0.0/16"
+}
+
+variable "subnet_name" {
+  default = "default"
+}
+
+variable "subnet_address_prefix" {
+  default = "10.0.0.0/24"
+}
+
+variable "network_security_group_name" {
+  default = "defaultnsg"
+}
+
+variable "public_ip_address_name" {
+  default = "linuxboxpip"
+}
+
+variable "vm_name" {
+  default = "matebox"
+}
+
+variable "vm_size" {
+  default = "Standard_B1s"
+}
+
+variable "ssh_key_public" {
+  default = "ssh-rsa AAAAB3Nz...yourkey"
+}
+
+variable "dns_label" {
+  default = "matetask"
+}