add support for Solaris

[kulikjak]

This change adds support for Solaris (very similar to #48).

cargo test is green, was complaining about unknown field self.0.domainname before.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.90%. Comparing base (c739331) to head (f76ef8c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   94.89%   94.90%           
=======================================
  Files           4        4           
  Lines         941      942    +1     
=======================================
+ Hits          893      894    +1     
  Misses         48       48           

Flag	Coverage Δ
macos_latest	99.31% <100.00%> (+<0.01%)	⬆️
ubuntu_latest	99.31% <100.00%> (+<0.01%)	⬆️
windows_latest	94.40% <ø> (ø)

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[sylvestre]

thanks