.github/workflows/release: work around git clean

[croissanne]

The osbuild release action cleans the repository, removing the tarball
that gets uploaded to the release. This tarball needs to be built before
schutzbot commits the version bump, so move it so it doesn't get
cleaned.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.17%. Comparing base (79ca7c6) to head (22b8155).
Report is 4 commits behind head on main.

@@           Coverage Diff           @@
##             main    #2823   +/-   ##
=======================================
  Coverage   83.17%   83.17%           
=======================================
  Files         190      190           
  Lines       22233    22233           
  Branches     2173     2174    +1     
=======================================
  Hits        18492    18492           
  Misses       3719     3719           
  Partials       22       22           

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[kingsleyzissou]

Trial & error haha