azurerm_kubernetes_cluster web_app_routing should allow dns_zone_id to be optional

[evangryska94]

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Description

When creating or updating an Azure Kubernetes Cluster and enabling web_app_routing, Terraform requires dns_zone_id to be provided which forces the Azure Kubernetes Cluster to use Azure DNS. Using Azure CLI, web_app_routing can be enabled without providing a dns_zone_id which allows you to bring your own private DNS. Terraform should support allowing you to use web_app_routing without providing an Azure dns_zone_id.

New or Affected Resource(s)/Data Source(s)

azurerm_kubernetes_cluster

Potential Terraform Configuration

resource "azurerm_kubernetes_cluster" "example" {
  name                = "example-aks1"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  dns_prefix          = "exampleaks1"

  default_node_pool {
    name       = "default"
    node_count = 1
    vm_size    = "Standard_D2_v2"
  }

  identity {
    type = "SystemAssigned"
  }

  web_app_routing {
    dns_zone_id = "" # Should allow empty string or no value passed, as Azure CLI supports
  }

  tags = {
    Environment = "Production"
  }
}

References

No response

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