Push manifest to OCI layout

[jonesbusy]

Description

Push manifest to OCI layout

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 95.23810% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.29%. Comparing base (7a36a8a) to head (325c778).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/OCILayout.java	89.47%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #207      +/-   ##
============================================
+ Coverage     84.78%   85.29%   +0.50%     
- Complexity      411      425      +14     
============================================
  Files            33       33              
  Lines          1387     1428      +41     
  Branches        150      159       +9     
============================================
+ Hits           1176     1218      +42     
  Misses          142      142              
+ Partials         69       68       -1     

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