enhance: ppc64le support with Buildkite CI job

[sumitd2]

issue: #29566

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[mergify]

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@sumitd2

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.75%. Comparing base (3e2a2f2) to head (fdee245).
Report is 61 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38485      +/-   ##
==========================================
+ Coverage   80.91%   82.75%   +1.83%     
==========================================
  Files        1373     1081     -292     
  Lines      193158   167023   -26135     
==========================================
- Hits       156295   138218   -18077     
+ Misses      31349    23279    -8070     
- Partials     5514     5526      +12     

Components	Coverage Δ
Client	74.58% <ø> (ø)
Core	∅ <ø> (∅)
Go	82.98% <ø> (-0.04%)	⬇️

see 321 files with indirect coverage changes

[sumitd2]

@xiaofan-luan To get the ppc64le GHA task passing you will have to create a free Buildkite account, and connect this repo to it. Then create a pipeline (without hooks) which will call scripts/ppc64le-docker-build-test.sh. Then you need to provide me with the pipeline name, the api token (with read-builds and write-builds scope), and the agent token to be updated on the OSU server you have been assigned by us. The whole process shouldn't take more than 10 minutes. (Buildkite has been chosen because its agent supports power).