How to create a function inside an Azure function app?

Terraform
1

I created an Terraform pipeline in Azure DevOps with the code below. How can I add an function inside the Azure function app?

Azureresources.tf

resource "azurerm_storage_account" "storageAccount" {
  name                     = "funcappterformpocm365"
  resource_group_name      = data.azurerm_resource_group.this.name
  location                 = var.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
}

resource "azurerm_app_service_plan" "functionApp" {
  name                = "azure-functions-test-service-plan"
  location            = var.location
  resource_group_name = data.azurerm_resource_group.this.name

  sku {
    tier = "Standard"
    size = "S1"
  }
}

resource "azurerm_windows_function_app" "example7" {

  name                       = "az-func-app-terform-poc-m365-G"
  location                   = var.location
  resource_group_name        = data.azurerm_resource_group.this.name
  service_plan_id            = azurerm_app_service_plan.functionApp.id
  storage_account_name       = azurerm_storage_account.storageAccount.name
  storage_account_access_key = azurerm_storage_account.storageAccount.primary_access_key

  site_config {}

  app_settings = {
        FUNCTIONS_WORKER_RUNTIME = "powershell"
        FUNCTIONS_WORKER_RUNTIME_VERSION = "7.4"
  }

  depends_on = [azurerm_storage_account.storageAccount, azurerm_app_service_plan.functionApp]
}

Run.ps1

# Input bindings are passed in via param block.
param($Timer)

# Get the current universal time in the default string format.
$currentUTCtime = (Get-Date).ToUniversalTime()

# The 'IsPastDue' property is 'true' when the current function invocation is later than scheduled.
if ($Timer.IsPastDue) {
    Write-Host "PowerShell timer is running late!"
}

# Write an information log with the current time.
Write-Host "PowerShell timer trigger function ran! TIME: $currentUTCtime"

Function.ps1

{
  "bindings": [
    {
      "name": "Timer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "0 */5 * * * *"
    }
  ]
}