Render ansible inventory from terraform

render.tf

#To templates dir to render from
${ansvars}
${group}
${servers}


#To VM module main.tf
data "template_file" "inventory" {
  template = file("${path.module}/templates/ansible_inv.tpl")

  depends_on = [
    azurerm_virtual_machine.vm,
    azurerm_network_interface.vm_nix,
  ]

  vars = {
    ansvars = "[${var.group_name}:vars]\nansible_user = ${var.admin_username}"
    group   = "[${var.group_name}]"
    servers = join("\n", azurerm_public_ip.vm-pip.*.ip_address) #azurerm_network_interface.vm-nix.*.private_ip_address
  }
}

resource "null_resource" "ansible" {
  triggers = {
    template_rendered = data.template_file.inventory.rendered
  }

  provisioner "local-exec" {
    command = "echo '${data.template_file.inventory.rendered}' >> inventory"
  }
}