chore: fetch nginx from ECR Public Gallery

[ThirdEyeSqueegee]

Issue #, if available:
N/A

Description of changes:

• The nginx image currently defined in the example deployment files isn't accessible from clusters in AWS China regions. Fetch nginx from the ECR Public Gallery to fix this.
• Format yaml files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.10%. Comparing base (6dbe3b9) to head (4118174).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   60.10%   60.10%           
=======================================
  Files          11       11           
  Lines         762      762           
=======================================
  Hits          458      458           
  Misses        287      287           
  Partials       17       17           

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[simonmarty]

There's really only two lines of diff in here, can we remove the formatting changes?