Clean up gpg keys

[changusmc]

The publish step in the Github Action is already calling this script, but it doesn't exist in main yet.

[codecov]

Codecov Report

Merging #75 (17d2db8) into main (32ad039) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #75   +/-   ##
=========================================
  Coverage     49.31%   49.31%           
  Complexity       47       47           
=========================================
  Files            12       12           
  Lines           438      438           
  Branches         97       97           
=========================================
  Hits            216      216           
  Misses          192      192           
  Partials         30       30           

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