This is especially important for distributions like NixOS where `/bin/bash` doesn't exist, or for MacOS users who've installed a newer version of Bash than the one that comes with their OS.
Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
Allow each script to run directly without the hack/make.sh wrapper. These
scripts do not produce artifacts and do not benefit from the "bundles"
framework.
Signed-off-by: Daniel Nephin <dnephin@docker.com>
