Added defaults and environments for production

roles/traefik/defaults/main.yml

@@ -0,0 +1,3 @@
+traefik_version: latest
+traefik_port: 8000
+traefik_admin_port: 8080

roles/traefik/tasks/main.yml

@@ -6,11 +6,11 @@
 - name: Start Traefik container
   docker_container:
     name: traefik
-    image: traefik:2.0.2
+    image: traefik:{{ traefik_version }}
     restart_policy: always
     ports:
-      - 8000:80
-      - 8080:8080
+      - "{{ traefik_port }}:80"
+      - "{{ traefik_admin_port }}:8080"
     volumes:
       - ./traefik.yml:/etc/traefik/traefik.yml
       - /var/run/docker.sock:/var/run/docker.sock