We can not pipe to atf_shell as it will make it run in a subshell and
will not handle failures properly.

Fixes commit ab67ab07 (setup-proxy: fix empty proxy)

the while loop loops until the value of proxyurl is none or a http*://
scheme. however, when proxyurl is set to 'none', it then gets unset here
(`proxyurl= ;`), but the following `if` block checks if it is 'none' and
fails, so we configure an empty http_proxy= in the proxy.sh profile
script. this is then read by some software, and it causes it to crash.
for instance, flatpak via glib reads `http_proxy` from the environment,
and an empty variable is illegal.

fixes https://gitlab.alpinelinux.org/alpine/aports/-/issues/13839

fixes https://gitlab.alpinelinux.org/alpine/aports/-/issues/13861

Do not enter interactive mode if -c was set, for backwards compatiblity.

fixes https://gitlab.alpinelinux.org/alpine/alpine-conf/-/issues/10513

setup-alpine conditionally runs some parts depending on `openrc --sys`
output. Add a fake openrc so we can test this in the future.

This also fixes the CI which may not have openrc installed.

This makes it possible to test the scripts

Assume that PATH is set up properly for testing. This makes it possible
to test setup-alpine without installing it with the sbin prefix.

this was (presumabely) originally intended for testing. We use MOCK
instead nowdays.

Only ask user for keymap from virtual consoles.

Retry create luks device if the entered password does not match rather
than exit with error.

fixes https://gitlab.alpinelinux.org/alpine/alpine-conf/-/issues/10514

Fail early if disk is too small or similar

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.