How do I ouput a Redox image using the installer

I don’t seem to understand the Redox installer. I build and run it just fine and it make a file system in sysroot. But after that I have no idea what to do. The says that I can specify if I want to output an ISO, QEMU, or VirtaulBox image but i can’t seem to get anything but a file system directory. I run the installer using the default.toml config. I have also used the example, but I just don’t get it.

The redox repository creates images using the installer. The best way to build them quickly is with make travis, once the Rust breakage is fixed