Add hcl extention for nomad files

to get syntax highlighting be default.

2-nomad-config/services.tf

@@ -4,13 +4,13 @@ provider "nomad" {
 }
 
 resource "nomad_job" "hello_world" {
-  jobspec = file("hello-world.nomad")
+  jobspec = file("hello-world.nomad.hcl")
 }
 
 resource "nomad_job" "traefik" {
-  jobspec = file("traefik.nomad")
+  jobspec = file("traefik.nomad.hcl")
 }
 
 resource "nomad_job" "webapp" {
-  jobspec = file("webapp.nomad")
+  jobspec = file("webapp.nomad.hcl")
 }