NixOS broken due to hardcoded /bin/pkexec

[Shringe]

This crate fails on NixOS due to the error below. I believe this is due to this crate hardcoding the pkexec path as /bin/pkexec. NixOS uses the path /run/wrappers/bin/pkexec instead.

I'm not sure how other apps handle this, but all other apps on my system can find pkexec on NixOS without issue. A hacky solution would be check /bin/pkexec first, and then use /run/wrappers/bin/pkexec as a fallback.

Here is the error code when using the crate:

called `Result::unwrap()` on an `Err` value: No such file or directory (os error 2)

[Shringe]

I also just found that using the pkexec binary in path works as expected as well like such: Command::new("pkexec"). Is there any reason /bin/pkexec is hardcoded into the program? Changing it to just pkexec should resolve this issue, as well as issues with any other Linux distributions that have their pkexec path somewhere else.