fix: uv-cache dir misplaced

[NeilSmithDLS]

Moving the .uv-cache folder from scratch to /app. This has the benefit of speeding up the population of the cache and removing an error regading not being able to create hard links

fixes #1455

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.25%. Comparing base (9f15b40) to head (f516668).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1500      +/-   ##
==========================================
+ Coverage   95.22%   95.25%   +0.03%     
==========================================
  Files          43       43              
  Lines        3144     3164      +20     
==========================================
+ Hits         2994     3014      +20     
  Misses        150      150              

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