Set umask=0 when creating unix sockets

[eternal-flame-AD]

Fixes #741

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.33%. Comparing base (cc7da2a) to head (a9731fd).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
runner/runner.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #743      +/-   ##
==========================================
- Coverage   79.42%   79.33%   -0.10%     
==========================================
  Files          56       56              
  Lines        2639     2642       +3     
==========================================
  Hits         2096     2096              
- Misses        452      455       +3     
  Partials       91       91              

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