We must not rely on DHCP and use installimage's static NetworkManager
configuration. While we could try to read the NM configuration and
configure systemd-networkd, we decided against it, as NetworkManager is
the default on Rocky Linux.
Configure dracut/the initramfs to a. include NetworkManager and b.
that we need networking in early boot (rd.neednet=1).
Closes gh-1.
Closes gh-3.