Caching downloaded postgres archives

[qarmin]

The changes required in the repository to properly implement and test caching of downloaded PostgreSQL packages go beyond the amount of time I’d like to spend on preparing a fix.

That’s why I only created a quick patch, which in my case completely resolved the CI issue with PostgreSQL packages being repeatedly downloaded.

I’m sharing this as a temporary workaround — in case someone else finds it useful — until #211 is closed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.35%. Comparing base (db095b7) to head (d76c5b3).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files          76       76           
  Lines        9575     9575           
=======================================
  Hits         9322     9322           
  Misses        253      253           

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[brianheineman]

@qarmin Thank you for the contribution! I updated the code to work with all operating systems and keep the original archive name.