feat: support default values in tls.NewConfigFromEnv

[Fedosin]

Changes

Add a DefaultMinTLSVersion constant (TLS 1.3) and an optional defaults parameter to NewConfigFromEnv so callers can supply fallback values for fields not set by environment variables. The webhook package now passes DefaultMinTLSVersion through the new parameter, simplifying its TLS setup logic.

/kind enhancement

Fixes #

Release Note

tls.NewConfigFromEnv now accepts an optional defaults Config, letting callers supply fallback values for any field not set by an environment variable. A new DefaultMinTLSVersion constant (TLS 1.3) is exported for convenience. The webhook package uses this to simplify its TLS setup.

Docs

[knative-prow]

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[Fedosin]

/hold

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.88%. Comparing base (1f39e94) to head (76dbbdd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3327   +/-   ##
=======================================
  Coverage   74.87%   74.88%           
=======================================
  Files         189      189           
  Lines        8299     8302    +3     
=======================================
+ Hits         6214     6217    +3     
  Misses       1844     1844           
  Partials      241      241           

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[knative-prow-robot]

PR needs rebase.

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