fix roundcube static files

hosts/ytnix/default.nix

@@ -177,6 +177,7 @@
     sbctl # secure boot
     wine-wayland
     wine64
+    solaar
   ];
 
   environment.sessionVariables = {

modules/roundcube.nix

@@ -43,6 +43,7 @@ in
       import common
       root ${roundcube.package}
       php_fastcgi unix/${fpm.socket}
+      file_server
     '';
   };
 }