feat: add slack channel

[zyxxoo]

Purpose of the PR

• close #xxx

Main Changes

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:
  • xxx

Does this PR potentially affect the following parts?

• Dependencies (add/update license info & regenerate_known_dependencies.sh)
• Modify configurations
• The public API
• Other affects (typed here)
• Nope

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.62%. Comparing base (18569c4) to head (8d1d44e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2920      +/-   ##
============================================
+ Coverage     35.61%   35.62%   +0.01%     
  Complexity      333      333              
============================================
  Files           802      802              
  Lines         67539    67539              
  Branches       8774     8774              
============================================
+ Hits          24051    24060       +9     
+ Misses        40927    40922       -5     
+ Partials       2561     2557       -4     

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