bump alpine version back to 3.18.4

[komer3]

After dependabot version update for alpine version 3.20.x, we were seeing xfs mounting failures. This is a known issue with alpine version after 3.19. We need to test some solutions before we can bump up the version.

Solution for now is to revert back to 3.18.4 until we find a robust solution for the new version

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.13%. Comparing base (7ae3bd0) to head (cecf444).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #255   +/-   ##
=======================================
  Coverage   40.13%   40.13%           
=======================================
  Files          26       26           
  Lines        1936     1936           
=======================================
  Hits          777      777           
  Misses       1120     1120           
  Partials       39       39           

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