Added support for build, image, and volume quadlets
Resolved test failures due to podman 5.3.0 upgrade
Replaced several instances of pkgs.podman with services.podman.package
Instead of having to manually stub packages that should not be
downloaded we instead automatically stub all packages (except a small
list of whitelisted ones). Tests can re-introduce the real package by
using the `realPkgs` module argument.
Adds a new Podman module for creating user containers and networks as
systemd services. These are installed to the user's
`$XDG_CONFIG/systemd/user` directory.
