Merge pull request #132345 from lukegb/fix-eval

nixos/virtualbox-image: cast baseImageFreeSpace to str

nixos/modules/virtualisation/virtualbox-image.nix

···
       inherit pkgs lib config;
       partitionTableType = "legacy";
       diskSize = cfg.baseImageSize;
-      additionalSpace = cfg.baseImageFreeSpace;
+      additionalSpace = "${toString cfg.baseImageFreeSpace}M";
 
       postVM =
         ''