doc: add certgen description into chart readme

[ShyunnY]

What type of PR is this?

doc: add certgen description into chart readme

What this PR does / why we need it:

Which issue(s) this PR fixes:

ref: #3521

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.22%. Comparing base (ab3a3d2) to head (5676546).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3569      +/-   ##
==========================================
+ Coverage   68.19%   68.22%   +0.03%     
==========================================
  Files         168      168              
  Lines       20408    20560     +152     
==========================================
+ Hits        13918    14028     +110     
- Misses       5490     5520      +30     
- Partials     1000     1012      +12     

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[ShyunnY]

PTAL
@zhaohuabing
@arkodg

[ShyunnY]

ci gen-check block on #3555

[arkodg]

@ShyunnY you will also need to run make helm-docs to generate the o/p

[arkodg]

weird how it didn't fail geo-check

[ShyunnY]

helm-docs

Does the helm-docs Target exist?
I don't seem to see it in my local main branch:

$ make helm-docs
make[1]: Entering directory '/home/shyunn/envoy-gateway'
make[1]: *** No rule to make target 'helm-docs'.  Stop.
make[1]: Leaving directory '/home/shyunn/envoy-gateway'
make: *** [Makefile:18: _run] Error 2

[shawnh2]

it's helm-readme-gen which arko was referring to.

but it seems we cannot generate content from the comments in helm chart.

[arkodg]

looks like # -- <some text> is the doc string format

[ShyunnY]

looks like # -- <some text> is the doc string format

I have done that.

I checked the helm-docs tool. It seems that after we add the # -- <comment> comment, the object's fields will be folded into the Default column. I checked the corresponding documentation and it seems that there is no way to solve it. But this is not a problem, it just looks a bit strange.

[shawnh2]

LGTM! Thanks!

[arkodg]

Thanks !