Add post-18 stage

[axlewin]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.26%. Comparing base (cbf28da) to head (6a72b56).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #734   +/-   ##
=======================================
  Coverage   37.26%   37.26%           
=======================================
  Files         536      536           
  Lines       23733    23733           
  Branches     2861     2861           
=======================================
  Hits         8843     8843           
  Misses      14008    14008           
  Partials      882      882           

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