Warn and suppress duplicate registry mirror endpoints

[brandond]

Proposed Changes

Warn and suppress duplicate registry mirror endpoints

Types of Changes

bugfix

Verification

See linked issue and test

Testing

yes

Linked Issues

• Duplicate mirror endpoint causes containerd to fail to load mirror config from hosts.toml #9693

User-Facing Change

K3s will now warn and suppress duplicate entries in the mirror endpoint list for a registry. Containerd does not support listing the same endpoint multiple times as a mirror for a single upstream registry.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 42.82%. Comparing base (1c8be1d) to head (bbe2927).
Report is 1 commits behind head on master.

Files	Patch %	Lines
pkg/agent/containerd/config.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9697      +/-   ##
==========================================
- Coverage   50.69%   42.82%   -7.87%     
==========================================
  Files         154      154              
  Lines       13595    13599       +4     
==========================================
- Hits         6892     5824    -1068     
- Misses       5361     6670    +1309     
+ Partials     1342     1105     -237     

Flag	Coverage Δ
e2etests	35.25% <0.00%> (-9.45%)	⬇️
inttests	34.87% <0.00%> (-4.50%)	⬇️
unittests	16.18% <75.00%> (+0.03%)	⬆️

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