In order to facilitate things like air-gapped on-prem depot installs, where we want to bootstrap a fresh depot with a full set of core packages, we need the ability to do the equivalent of
hab pkg install without the
install part. That is, we need a command that will download a package and all of its transitive dependencies to disk, and stop there.
This command should allow specifying an arbitrary location on disk for the resulting packages to be downloaded to, along with a sensible default (probably