Tighten output file permissions

[AndrewAsseily]

Issue #, if available:

Description of changes:

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.43%. Comparing base (c4681b5) to head (3e9d8a5).
⚠️ Report is 256 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10197      +/-   ##
===========================================
+ Coverage    93.39%   93.43%   +0.04%     
===========================================
  Files          210      210              
  Lines        17052    17235     +183     
===========================================
+ Hits         15925    16103     +178     
- Misses        1127     1132       +5     

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