Add support for custom application directory with --config

[m4siha]

Fixes #129

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.97%. Comparing base (6fbbeda) to head (bf0c34d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   73.97%   73.97%           
=======================================
  Files          69       69           
  Lines       29154    29154           
=======================================
  Hits        21567    21567           
  Misses       7587     7587           

see 2 files with indirect coverage changes

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