chore: add a demo for deployment on k8s as a sidecar

[seeflood]

Signed-off-by: seeflood zhou.qunli@foxmail.com

What this PR does:
add a demo for deployment on k8s as a sidecar

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov]

Codecov Report

Merging #742 (5901ef8) into main (a68dac7) will not change coverage.
The diff coverage is n/a.

❗ Current head 5901ef8 differs from pull request most recent head 37d5750. Consider uploading reports for the commit 37d5750 to get more accurate results

@@           Coverage Diff           @@
##             main     #742   +/-   ##
=======================================
  Coverage   60.60%   60.60%           
=======================================
  Files         133      133           
  Lines        8318     8318           
=======================================
  Hits         5041     5041           
  Misses       2700     2700           
  Partials      577      577           

Impacted Files	Coverage Δ
pkg/grpc/extension/s3/s3.go	62.01% <ø> (ø)

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