Push attach artifact into OCI API

[jonesbusy]

Description

Push attach artifact into OCI API

Testing done

CI

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

Attention: Patch coverage is 88.23529% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.55%. Comparing base (d3d3ce9) to head (cad6747).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/LayoutRef.java	33.33%	1 Missing and 1 partial ⚠️
src/main/java/land/oras/OCI.java	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #221      +/-   ##
============================================
+ Coverage     85.54%   85.55%   +0.01%     
- Complexity      458      465       +7     
============================================
  Files            33       33              
  Lines          1515     1530      +15     
  Branches        173      175       +2     
============================================
+ Hits           1296     1309      +13     
- Misses          145      146       +1     
- Partials         74       75       +1     

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