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if there are no controlling reminal getlogin() may return NULL. We use
getpwuid() to try figure out the username and verify that we actually
have a username before we set environment USER.

This patch is based on earlier work by Timo Teräs.

set our gid to root so apk commit hooks run with the same gid as when
running  "sudo apk add ..." from command line.

Few days ago some user on IRC pointed out that the current error message:

    abuild-apk: Not a member of group abuild

is confusing. He was trying to build a package using abuild -r and
didn't know what this message means.

fixes #5408

It means that home built packages cannot be installed with abuild-apk
unless the key is installed system-wide.

seems like it moved in recent busybox. we need to support both variants

mini sudo that checks if user is in "abuild" group and allows it to
run apk, adduser adn addgroup as root

ref #951