Use al, gh, and gl as magic keywords to suggest url for shs key

Don't ask about root login if a user account was created

Ask for ssh key in separate question unless PermitRootLogin was set to
no.

apparently atf_check can not run in a subshell so we can not pipe the
input. Use a temp file for the answers instead

Add a '?' option for help

Add magic keywords 'al|gh|gl <user>' to suggest gitlab.alpinelinux.org,
github.com or gitlab.com URL to user's key. This is to conveniently
fetch ssh keys without needing to type long URLs.

Use 'ssh' in lowercase consistently
Fix duplicate [prohibit-password]

when -a is specified, doas gets installed and configured and username is
added to wheels group for doas privileges

The username is shorter than full name so ask for that first and suggest
the username as fullname which will make the username show up in login
menu instead of 'Linux User'.

If -f FULLNAME is specified, then give a decent default suggestion based
on first letter in first name and lastname.

Make it possible to simulate wget errors by fetching an URL with 'fail'
or '404' in the URL string. 'fail' results in DNS error(ish) and '404'
returns a 404 error message.

so we can simulate fetching things from internet

use first char in first name and all last name, in lower case as
suggested user name.

this replaces setup-xfce-desktop

The script should set up a minimal, but usable desktop environment with
some sane defaults.

with tests to verify that it works

and add tests for it to verify that it actually works as expected

We can use this for the other tests later

some devices, like NVME may have a physical block size of 4096, in which
case FAT32 needs  minimum 260MB.

Use physical_block_size to calculate the size for ESP