Allow user to specify output directory

[ppinchuk]

When build routing layers, it can be helpful to be able to specify the output directory so that the user can test different configuration sets.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (008fc63) to head (82cf75c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #276   +/-   ##
=======================================
  Coverage   96.65%   96.66%           
=======================================
  Files          27       27           
  Lines        3233     3234    +1     
  Branches      391      391           
=======================================
+ Hits         3125     3126    +1     
  Misses         61       61           
  Partials       47       47           

Flag	Coverage Δ
unittests	96.66% <100.00%> (+<0.01%)	⬆️

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