add loading config overrides from a filemount

[gtmanfred]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.85%. Comparing base (5169486) to head (db650f0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
figenv.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #12      +/-   ##
===========================================
- Coverage   100.00%   96.85%   -3.15%     
===========================================
  Files            1        1              
  Lines          115      127      +12     
  Branches        23       26       +3     
===========================================
+ Hits           115      123       +8     
- Misses           0        4       +4     

Flag	Coverage Δ
unittests	96.85% <87.50%> (-3.15%)	⬇️

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