Unable to connect db with api service using nomad as provider

Nomad
1

my app is not conecting to database; I am using simple nomad service discovery. Here is my job file any help please

variable “datacenters” {
description = “A list of datacenters in the region which are eligible for task placement.”
type = list(string)
default = [“dc1”]
}

variable “region” {
description = “The region where the job should be placed.”
type = string
default = “global”
}

variable “postgres_db” {
description = “Postgres DB name”
default = “vehicle_master_bd”
}

variable “postgres_user” {
description = “Postgres DB User”
default = “postgres”
}

variable “postgres_password” {
description = “Postgres DB Password”
default = “postgres”
}

Begin Job Spec

job “cres-vehicleMaster” {
type = “service”
region = var.region
datacenters = var.datacenters
group “db” {
network {
port “db” {
to = 5432
}
}

task "postgres" {
  driver = "docker"

  meta {
    service = "database"
  }
  service {
    name     = "database"
    port     = "db"
    provider = "nomad"
  }
  config {
    image = "postgres"
    ports = ["db"]
  }
  resources {
    cpu    = 500
    memory = 500
  }
  env {

    POSTGRES_DB       = var.postgres_db
    POSTGRES_USER     = var.postgres_user
    POSTGRES_PASSWORD = var.postgres_password
  }
}

}
group “vehicleMaster-api” {
count = 1
network {
port “api” {
to = 50080
}
}

restart {
  attempts = 2
  interval = "30m"
  delay    = "15s"
  mode     = "fail"
}

task "vehicleMaster-api" {
  driver = "docker"
  service {
    name     = "vehicleMaster-api"
    tags     = ["vehicleMaster", "RESTAPI"]
    port     = "api"
    provider = "nomad"
  }
  template {
    data        = <<EOH

{{ range nomadService “database” }}
DB_CONN=“host={{ .Address }} port={{ .Port }} user={var.postgres_user} password={var.postgres_password} dbname={var.postgres_db} sslmode=disable" {{ end }} EOH destination = "local/env.txt" env = true } env { // DB_CONN = "host=127.0.0.1 port=5432 user=postgres password=postgres dbname=vehicle_master_bd sslmode=disable" // DB_CONN = "host={NOMAD_IP_postgres} port={NOMAD_PORT_postgres} user={var.postgres_user} password={var.postgres_password} dbname={var.postgres_db} sslmode=disable”
PORT = “50080”
}
config {
image = “jpalaparthi/vehiclemaster:v0.0.3”
ports = [“api”]
}
resources {
cpu = 500 # 500 MHz
memory = 512 # 256MB
}
}
}
}