chart: make webhook optional

[haorenfsa]

Fix #132

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.92%. Comparing base (a42492e) to head (b17fc14).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/util/util.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #210       +/-   ##
=========================================
+ Coverage      0   80.92%   +80.92%     
=========================================
  Files         0       56       +56     
  Lines         0     6222     +6222     
=========================================
+ Hits          0     5035     +5035     
- Misses        0     1000     +1000     
- Partials      0      187      +187     

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