fix(nextcloud): push server is not a trusted proxy

The nextcloud push service would fail with the following error message
when deploying a new version:

please add '2a01:4f8:172:1c25::1' to the list of trusted proxies or
configure any existing reverse proxy to forward the 'x-forwarded-for'
send by the push server
The following x-forwarded-for header was received by Nextcloud: 1.2.3.4
The following trusted proxies are currently configured: "127.0.0.1", "::1"

https://docs.nextcloud.com/server/stable/admin_manual/configuration_server/reverse_proxy_configuration.html#defining-trusted-proxies

hosts/nachtigall/apps/nextcloud.nix

@@ -50,6 +50,8 @@
       trustedProxies = [
         "127.0.0.1"
         "::1"
+        "138.201.80.102"
+        "2a01:4f8:172:1c25::1"
       ];
     };