alpine-conf: setup-timezone stuck if tzdata failed to install
https://github.com/alpinelinux/alpine-conf/blob/master/setup-timezone.in
no way to select none or break like keymaps to exit.
ask "Which timezone are you in? ('?' for list)" "$default_timezone"
timezone="$resp"
case "$timezone" in
"") continue;;
"?") show_tz_list; continue;;
esac