Support AWS_SHARED_CREDENTIALS_FILE

[synfinatic]

Fixes: #914

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.86%. Comparing base (28af09a) to head (11e720f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #942   +/-   ##
=======================================
  Coverage   83.86%   83.86%           
=======================================
  Files          41       41           
  Lines        3005     3005           
=======================================
  Hits         2520     2520           
  Misses        392      392           
  Partials       93       93           

Flag	Coverage Δ
unittests	83.86% <ø> (ø)

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