Added a CI build with UNIX sockets disabled

[anarthal]

close #196

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.33%. Comparing base (a918c6b) to head (dfb8bdc).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #310      +/-   ##
===========================================
- Coverage    98.35%   98.33%   -0.02%     
===========================================
  Files          128      129       +1     
  Lines         5886     5895       +9     
===========================================
+ Hits          5789     5797       +8     
- Misses          97       98       +1     

see 3 files with indirect coverage changes

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