feat: Differenciate backend & frontend hostnames

* Route the backend server with a certresolver for automatic TLS
  certificate provisioning and the frontend without the certresolver
  set.

* Plain text is kept responding to all hosts.

env/netbox.env

@@ -32,3 +32,5 @@ RELEASE_CHECK_URL=https://api.github.com/repos/netbox-community/netbox/releases
 SECRET_KEY='r(m)9nLGnz$(_q3N4z1k(EFsMCjjjzx08x9VhNVcfd%6RF#r!6DE@+V5Zk2X'
 SKIP_SUPERUSER=true
 WEBHOOKS_ENABLED=true
+NETBOX_FRONTEND_HOST=netbox-front.localhost
+NETBOX_BACKEND_HOST=netbox-back.localhost