add multi-arch image for e2e-resources/hpa

[TmNguyen12]

Description

• change to nginx:alpine for multiarch support (rancher-desktop:QEMU)
• nginx:alpine image size is 9x smaller than hpa-example for quicker pulls

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature / enhancement (non-breaking change which adds functionality)
• Security fix
• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Add changelog entry following the contributing guide
• Documentation has been updated
• This change requires changes in testing:
  • unit tests
  • E2E tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.80%. Comparing base (3fb99dd) to head (96a62ff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1298   +/-   ##
=======================================
  Coverage   63.80%   63.80%           
=======================================
  Files          55       55           
  Lines        4349     4349           
=======================================
  Hits         2775     2775           
  Misses       1402     1402           
  Partials      172      172           

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