Fix GnuPG missing directory

[didierofrivia]

In order to fix the chart creation and signing job: https://github.com/Kuadrant/dns-operator/actions/runs/13154643618/job/36708905169#step:3:8

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.54%. Comparing base (8c84a01) to head (1a90f48).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   61.54%   61.54%           
=======================================
  Files           2        2           
  Lines         788      788           
=======================================
  Hits          485      485           
  Misses        251      251           
  Partials       52       52           

Flag	Coverage Δ
unit	61.54% <ø> (ø)

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