ci: fix the usage of unstable container skip

[RobPasMue]

Looks like our SKIP_UNSTABLE_CONTAINERS_TEMPORARILY variable isn't being used properly anymore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.46%. Comparing base (db1753f) to head (9534847).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2001   +/-   ##
=======================================
  Coverage   90.46%   90.46%           
=======================================
  Files         136      136           
  Lines        9717     9717           
=======================================
  Hits         8790     8790           
  Misses        927      927           

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