CI: Check workflows and actions with zizmor

[str4d]

No description provided.

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[str4d]

I can't figure out how to get a working CI with ${{ steps.prepare.outputs.feature-flags }} expansion routed through an env variable. It seems that single quotes within an env variable are not preserved. For now I'm leaving those unaddressed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.22%. Comparing base (5651d80) to head (81be266).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1679   +/-   ##
=======================================
  Coverage   52.22%   52.22%           
=======================================
  Files         179      179           
  Lines       21353    21353           
=======================================
  Hits        11152    11152           
  Misses      10201    10201           

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