The special case of Nix bundling is useful for handling the hidden
dependencies of Nix. It will automatically add them for you when you
do this:
$ nix-bundle nix /bin/nix
pulled nix-user-chroot into the same repo
put the startup command into a bash script, so the tarball job knows its deps
changed nix-user-chroot into a c++ program
added CLI flags to allow configuring the sandbox it produces