[Traefik] Indicate default network in configuration

pica-traefik/traefik.toml

@@ -23,6 +23,7 @@
     watch = true
     endpoint = "unix:///var/run/docker.sock"
     exposedByDefault = false
+    network = "proxy"
   [providers.file]
     filename = "/traefik_dynamic.toml"
     watch = true