fix: add warning before spawning gpg

[aduh95]

I kinda forgot I moved to encrypted config file, and got surprised to be asked for my passphrase. Adding a warning so next time I forget, I won't be surprised.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.73%. Comparing base (24ecaa3) to head (93506e2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/config.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #986      +/-   ##
==========================================
- Coverage   79.75%   79.73%   -0.02%     
==========================================
  Files          39       39              
  Lines        4663     4664       +1     
==========================================
  Hits         3719     3719              
- Misses        944      945       +1     

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