(IGNORE) Simplify nightly workflow and make it more like the one in c2pa-rs

[scouten-adobe]

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 48.68%. Comparing base (b77b023) to head (909773d).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #144   +/-   ##
=======================================
  Coverage   48.68%   48.68%           
=======================================
  Files           4        4           
  Lines         684      684           
=======================================
  Hits          333      333           
  Misses        351      351           

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