Several fixes for ECR regitry

[jonesbusy]

Description

Testing done

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.34%. Comparing base (f0f2d4c) to head (044435e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/Registry.java	66.66%	3 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (73.33%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #523      +/-   ##
============================================
+ Coverage     87.53%   88.34%   +0.81%     
- Complexity      660      662       +2     
============================================
  Files            39       39              
  Lines          2021     2034      +13     
  Branches        230      233       +3     
============================================
+ Hits           1769     1797      +28     
+ Misses          160      145      -15     
  Partials         92       92              

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