feat(traefik): allow exposure of dashboard via domain

roles/traefik/templates/traefik.yml.j2

@@ -4,8 +4,10 @@ log:
 {% if enable_dashboard %}
 api:
   dashboard: true
+{% if not dashboard_domain %}
   insecure: true
 {% endif %}
+{% endif %}
 
 {% if enable_access_logs %}
 accessLog:
@@ -26,11 +28,9 @@ entryPoints:
     address: ":443"
 
 providers:
-{% if traefik_mode == 'dmz' %}
   file:
     directory: /config
     watch: true
-{% endif %}
 {% if traefik_mode == 'backend' %}
   docker:
     endpoint: "unix:///var/run/docker.sock"