Attempt to reduce spammy logs from external cred helpers

[imjasonh]

No description provided.

[imjasonh]

I'm not sure why ko with ko-build/ko#581 logs pkg/v1/google.Keychain errors, since AFAIK logs.Debug is discarded by default, and I don't see where ko changes that, if anywhere.

I'll need to look closer, ideas welcome.

[imjasonh]

lol nevermind this doesn't work anyway

[codecov-commenter]

Codecov Report

Merging #1283 (7653dc2) into main (d3202cc) will decrease coverage by 0.00%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##             main    #1283      +/-   ##
==========================================
- Coverage   74.03%   74.03%   -0.01%     
==========================================
  Files         112      112              
  Lines        8374     8391      +17     
==========================================
+ Hits         6200     6212      +12     
- Misses       1571     1575       +4     
- Partials      603      604       +1     

Impacted Files	Coverage Δ
pkg/authn/keychain.go	85.36% <82.35%> (-0.79%)	⬇️
pkg/v1/remote/multi_write.go	62.92% <0.00%> (-0.98%)	⬇️

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[imjasonh]

Closing in favor of hopefully making ecr-login's logging more configurable: awslabs/amazon-ecr-credential-helper#309