test: do not waste cycles on GPG signatures

[mih]

Even if a user has them activated.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.22%. Comparing base (d65e0df) to head (913145e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   99.22%   99.22%           
=======================================
  Files          58       58           
  Lines        2447     2447           
  Branches      175      175           
=======================================
  Hits         2428     2428           
  Misses         15       15           
  Partials        4        4           

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