Add commented snippet to enable when testing pkgs
Add commented snippet to enable when testing pkgs

Before submitting a pull request to nixpkgs, it's requested that you
test your package with the build-use-sandbox set to true.  This will
build your package in an isolated chroot.

I've left it here and commented out so that I don't have to look it up
every time.

KibaFox/dotfiles,KibaFox/dotfiles,KibaFox/dotfiles,KibaFox/dotfiles,KibaFox/dotfiles