Layer annotations where not added on files during pushArtifact

[jonesbusy]

Description

Layer annotations where not added on files during pushArtifact

Testing done

Updated one test

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 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.14%. Comparing base (2d39685) to head (4f14cb8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/OCI.java	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #583      +/-   ##
============================================
+ Coverage     87.96%   89.14%   +1.18%     
- Complexity      809      815       +6     
============================================
  Files            42       42              
  Lines          2393     2405      +12     
  Branches        293      295       +2     
============================================
+ Hits           2105     2144      +39     
+ Misses          177      151      -26     
+ Partials        111      110       -1     

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