Support for opendoas in privileges_linux.go

[humaidq-tii]

There is no support for the doas command, which is a secure alternative to sudo.

opendoas sets the DOAS_USER environment variables (e.g. DOAS_USER="humaid").

An alternate check should be added somewhere here, but the UID has to be fetched.

gokit/os/user/userutil/privileges_linux.go

Line 226 in 27b5c49

if os.Getenv("SUDO_UID") == "" { // not running under sudo

[joonas-fi]

I never heard of doas before, I like the idea of it :)

I installed it on my system. Will investigate, when I get the time, what it would take to support doas.