add env var defaults

[broothie]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 73.53%. Comparing base (6005355) to head (c2d6910).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
context.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   73.38%   73.53%   +0.14%     
==========================================
  Files          15       15              
  Lines         650      665      +15     
==========================================
+ Hits          477      489      +12     
- Misses        132      134       +2     
- Partials       41       42       +1     

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