Update Dockerfile

[pxaws]

Issue #, if available:

Description of changes:

Update Dockerfile to use public ECR image

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.71%. Comparing base (0f22bf0) to head (2d9164e).

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Additional details and impacted files

@@                Coverage Diff                 @@
##             release/v1.27.x     #918   +/-   ##
==================================================
  Coverage              85.71%   85.71%           
  Complexity                19       19           
==================================================
  Files                      3        3           
  Lines                     49       49           
  Branches                   5        5           
==================================================
  Hits                      42       42           
  Misses                     3        3           
  Partials                   4        4           

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