nomad + consul template comma separated services from tags

job.nomad.hcl

job web {
  datacenters = ["dc1"]
  type        = "service"
  priority    = 70

  group app {
    count = 1

    task env {
      driver = "exec"

      config {
        command = "/usr/bin/env"
      }

      template {
        env         = true
        destination = "${NOMAD_SECRETS_DIR}/env"
        data        = <<EOF
SERVICES_FROM_TAG={{range services}}{{if in .Tags "tag-name-goes-here"}}{{$services:=service .Name "any"}}{{if gt (len $services) 0}}{{range $services}}{{.Address}}:{{.Port}},{{end}}{{end}}{{end}}{{end}}
EOF
      }
    }
  }
}