- restructure module from `podman-linux` to platform-agnostic `podman`
- move linux-specific implementation to `modules/services/podman/linux/`
- add darwin module with declarative machine management
- implement launchd-based watchdog for auto-starting machines
- maintains backward compatibility with existing linux functionality
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.