Add the following question to "pmbootstrap init":
[22:12:57] Based on your UI selection, 'default' will result in installing systemd.
[22:12:57] Install systemd? (default/always/never) [default]:
Determine whether the UI prefers to have systemd or not, based on
"pmb:systemd" in the UI package's APKBUILD.
Determine whether the currently selected branch supports systemd, by
checking for a "[repo:systemd]" section in pmaports.cfg. This section
will also contain bootstrap information, to be used in future patches.