hippocampus: matrix: tuwunel/server: url preview enable

machines/hippocampus/servers/public/matrix/server.nix

@@ -30,6 +30,9 @@
           client = "https://glia.club";
           server = "glia.club:443";
         };
+
+        # TODO: Configure more in detail/for safety:
+        url_preview_domain_contains_allowlist = ["*"];
       };
     };
   };