Add tags to nren dashboard template

brian_dashboard_manager/templating/templates/nren_access/nren-dashboard.json.j2

@@ -17,7 +17,15 @@
   "graphTooltip": 0,
   "schemaVersion": 27,
   "style": "dark",
-  "tags": ["customers"],
+  {% if not tags %}
+  "tags": ["{{ tag }}"],
+  {% else %}
+  "tags": [
+    {% for tag in tags %}
+      "{{ tag }}"{{ "," if not loop.last }}
+    {% endfor %}
+  ],
+  {% endif %}
   "templating": {
     "list": []
   },