Docs: add instructions for generating support bundle when using a private authenticated registry

[RobertNorthard]

…vate registry which is authenticated

Issue #, if available:
N/A

Description of changes:
Added instructions for generating a support bundle when using a private authenticated registry

Testing (if applicable):
N/A

Documentation added/planned (if applicable):
Added instructions for generating a support bundle when using a private authenticated registr

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[eks-distro-bot]

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[eks-distro-bot]

Hi @RobertNorthard. Thanks for your PR.

I'm waiting for a aws member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.44%. Comparing base (0a9a495) to head (e47fa6c).
Report is 359 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8069      +/-   ##
==========================================
- Coverage   73.44%   73.44%   -0.01%     
==========================================
  Files         577      577              
  Lines       35878    35878              
==========================================
- Hits        26351    26349       -2     
- Misses       7861     7862       +1     
- Partials     1666     1667       +1     

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[sp1999]

/ok-to-test

[sp1999]

Did you verify locally that the support bundle gets generated after setting those env variables? What errors did you get when generating the support bundle without those env variables? It would be good to have that information in the PR description.