feat: add self-signed certs for mTLS

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 36.31%. Comparing base (5ab6450) to head (84ac6b3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
scheduler/resource/standard/seed_peer.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
- Coverage   36.44%   36.31%   -0.14%     
==========================================
  Files         335      335              
  Lines       31129    31112      -17     
==========================================
- Hits        11346    11299      -47     
- Misses      18951    18974      +23     
- Partials      832      839       +7     

Flag	Coverage Δ
unittests	36.31% <88.88%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
scheduler/config/config.go	87.57% <ø> (-0.98%)	⬇️
scheduler/resource/standard/peer.go	71.84% <100.00%> (-0.14%)	⬇️
scheduler/resource/standard/resource.go	63.63% <100.00%> (ø)
scheduler/service/service_v1.go	79.28% <100.00%> (ø)
scheduler/service/service_v2.go	78.75% <100.00%> (-0.13%)	⬇️
scheduler/resource/standard/seed_peer.go	25.00% <50.00%> (-0.69%)	⬇️

... and 5 files with indirect coverage changes

[fcgxz2003]

LGTM