services/searxng: don't hardcode base_url and traefik rule

services/searxng.nix

@@ -42,7 +42,7 @@ in
         server = {
           port = searxngPort;
           bind_address = "127.0.0.1";
-          base_url = "https://app-01.tail755c5.ts.net/search/";
+          base_url = "https://${config.networking.hostName}.tail755c5.ts.net/search/";
           public_instance = false;
           method = "POST";
           secret_key = "testkey";
@@ -60,7 +60,7 @@ in
     services.traefik.dynamicConfigOptions = {
       http.routers.searxng = {
         entrypoints = [ "websecure" ];
-        rule = "Host(`app-01.tail755c5.ts.net`) && PathPrefix(`/search`)";
+        rule = "Host(`${config.networking.hostName}.tail755c5.ts.net`) && PathPrefix(`/search`)";
         tls = true;
         service = "searxng";
       };