Expand and passing local template/config file to Nomad through terraform

Terraform Providers
1

Hi, I was not sure whether this would fit the terraform or the nomad topic since I am using both…

My goal is to run a batch job in Nomad that only prints the content of a file to stdout, the file is a template file that either Terraform or Nomad should instantiate based on an external variable message,

My issue is, that Nomad tasks run but the template is not expanded meaning, the task logs show.

hello ${message}

Instead of:

hello world!

These are the files used to reproduce the issue:

variables file vars.hcl, look var message contains the value to expand the template file

helloworld_file = "./helloworld.txt.tpl"
nomad_api_url = "https://server.global.nomad:4646"
secret_id = "--REDACTED--"
nomad_cacert = "nomad-agent-ca.pem"
nomad_client_cert= "global-cli-nomad.pem"
nomad_client_key= "global-cli-nomad-key.pem"
message = "world!"
datacenter = "default"

the template file helloworld.txt.tpl

hello ${message}

terraform script main.tf

variable "helloworld_file" {
  type = string
  description = "local path file"
}

variable "nomad_api_url" {
  type = string
}

variable "secret_id" {
  type = string
}

variable "nomad_cacert" {
  type = string
}

variable "nomad_client_cert" {
  type = string
}

variable "nomad_client_key" {
  type = string
}

variable "datacenter" {
  type = string
}

variable "message" {
  type = string
}

provider "nomad" {
  address = var.nomad_api_url 
  secret_id = var.secret_id
  ca_file = "${path.module}/provider_nomad_jobs/${var.nomad_cacert}"
  cert_file = "${path.module}/provider_nomad_jobs/${var.nomad_client_cert}"
  key_file = "${path.module}/provider_nomad_jobs/${var.nomad_client_key}"
}

resource "nomad_job" "test" {
  hcl2 {
    enabled = true
    vars = {
      "helloworld_file" = file("${var.helloworld_file}")
      "datacenter" = var.datacenter
      "message" = var.message
    }
  }

  jobspec = file("${path.module}/provider_nomad_jobs/nomad-test.hcl")

  detach = false
}

Nomad job provider_nomad_jobs/nomad-test.hcl

# Inject local files into the job ref https://discuss.hashicorp.com/t/passing-local-config-file-to-task/24598/3
variable "helloworld_file" {
  type = string
  description = "local path to file."
}

variable "datacenter" {
  type = string
}

variable "message" {
  type = string
}

job "nomad_test" {
  datacenters = ["${var.datacenter}"]
  type        = "batch"

  group "nomad_test" {
    task "exec" {
      driver = "raw_exec"
      user = "root"
      template {
        destination = "local/hello.txt"
        data = "${var.helloworld_file}"
      }
      config {
        command = "bash"
        args    = ["-c", "cat $NOMAD_TASK_DIR/hello.txt"]
      }
    }
  }
}

Before creating this ticket I tried this example Passing local config file to task - #3 by angrycub

Any idea what is wrong and how can I expand the message var in the helloworld.txt.tpl template so Nomad tasks get the file with the content hello world!?