onecode zip avoid warnings on duplicate files

[theweaklink]

multiple file_output with the same path would trigger a warning on onecode-zip archiving.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ca807f0) to head (096a627).
⚠️ Report is 4 commits behind head on 1.x.

Additional details and impacted files

@@            Coverage Diff            @@
##               1.x       #50   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        33           
  Lines          991       993    +2     
=========================================
+ Hits           991       993    +2     

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