fix: don't require secret at build-time

[balazsorban44]

Follow-up on #10305

setEnvDefaults might be invoked during build which started throwing an error in #10305.

This reverts the early check and makes sure that the runtime check correctly catches an unavailable secret value, avoiding the cryptic message shown in #10305

Fixes #10538

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.48%. Comparing base (6ddc329) to head (bf38de4).
Report is 2 commits behind head on main.

❗ Current head bf38de4 differs from pull request most recent head d75f74c. Consider uploading reports for the commit d75f74c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10592   +/-   ##
=======================================
  Coverage   40.48%   40.48%           
=======================================
  Files         172      172           
  Lines       27754    27748    -6     
  Branches     1174     1168    -6     
=======================================
- Hits        11235    11233    -2     
+ Misses      16519    16515    -4     

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