authelia: Allow anonymous access to vminsert

This way we can have push-based metrics without requiring any
authentication.

authelia/configuration.yml

@@ -36,6 +36,10 @@ access_control:
     networks:
     - internal
     policy: bypass
+  - domain: metrics.pyrocufflink.blue
+    resources:
+    - '^/insert/.*'
+    policy: bypass
   - domain: metrics.pyrocufflink.blue
     networks:
     - internal