Set up .local file before invoking LibFuzzer

[Porges]

Closes #3180.

[codecov-commenter]

Codecov Report

Merging #3269 (fa7fd3d) into main (8a12f95) will increase coverage by 0.03%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #3269      +/-   ##
==========================================
+ Coverage   31.38%   31.42%   +0.03%     
==========================================
  Files         313      313              
  Lines       37166    37199      +33     
==========================================
+ Hits        11663    11688      +25     
- Misses      25503    25511       +8     

Impacted Files	Coverage Δ
...t/onefuzz-task/src/tasks/fuzz/libfuzzer/generic.rs	45.45% <66.66%> (+45.45%)	⬆️

... and 2 files with indirect coverage changes