Add AWS_CONTAINER_AUTHORIZATION_TOKEN support

[synfinatic]

fixes: #516

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.29%. Comparing base (3f23df2) to head (046b0b6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #916      +/-   ##
==========================================
+ Coverage   83.07%   83.29%   +0.22%     
==========================================
  Files          38       40       +2     
  Lines        2741     2825      +84     
==========================================
+ Hits         2277     2353      +76     
- Misses        379      384       +5     
- Partials       85       88       +3     

Flag	Coverage Δ
unittests	83.29% <100.00%> (+0.22%)	⬆️

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Files	Coverage Δ
internal/ecs/client/client.go	92.50% <100.00%> (ø)

... and 1 file with indirect coverage changes

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