This had some shortcomings, so we revert. We will develop a
sane solution for this soon.

but allow to overwrite shadow file in initramfs with custom
/etc/shadow.initramfs.

* initcpio: get required groups from system

* use users and groups from basic.conf in initramfs

This covers both the case of MODULES being a string and an array in
/etc/mkinitcpio.conf.

- make cryptsetup hard dependency
- ship static nsswitch.conf in initramfs (FS#53095)

- fix verbiage in systemd hook about what it replaces

- ensure udevd runs with --resolve-names=never in early userspace (FS#49849)

- add rescue/emergency targets and needed machinery (FS#36265)

* backport changes fixing assertion fail with regenerated initramfs
* add workaround to initcpio-install-systemd for 654b036b[1]

[1] https://github.com/systemd/systemd/commit/654b036ba7368d

- install ctrl-alt-del.target as a symlink, not a file (FS#42510)
- add "missing" targets in initramfs (FS#42301)

- add resume generator to systemd initramfs hook
- backport fix for enabling templated units (FS#42616)
- backport fix for leaking FD on DHCP renew (FS#42214)
- backport fix for broken nspawn with --bind/--bind-ro
- backport fix for removing non-existing matches in sd-bus

- add debug package (not hosted in testing/core)

This hook allows you to boot with systemd in the initcpio instead of the current 'base'.