Support of unqualified-search-registries in registries.conf

[jonesbusy]

Description

Start implementation of registries.conf

Do not use any of config for now (Just log unqualified-search-registries for now)

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 89.62963% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.42%. Comparing base (fc87fc1) to head (5e5f017).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/ContainerRef.java	74.07%	3 Missing and 4 partials ⚠️
src/main/java/land/oras/utils/TomlUtils.java	63.63%	4 Missing ⚠️
src/main/java/land/oras/auth/RegistriesConf.java	88.88%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #434      +/-   ##
============================================
+ Coverage     87.59%   88.42%   +0.82%     
- Complexity      685      707      +22     
============================================
  Files            40       42       +2     
  Lines          2056     2117      +61     
  Branches        233      242       +9     
============================================
+ Hits           1801     1872      +71     
+ Misses          164      149      -15     
- Partials         91       96       +5     

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[Copilot]

Pull request overview

Implements initial parsing of containers/registries.conf (TOML) and wires it into registry/reference handling to support unqualified-search-registries, with accompanying test updates.

Changes:

• Added TomlUtils (Jackson TOML) and tests for TOML parse/serialize.
• Added RegistriesConf loader and tests for reading unqualified-search-registries from standard paths.
• Updated Registry/ContainerRef behavior and tests around effective registry selection for unqualified references.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
src/main/java/land/oras/utils/TomlUtils.java	New TOML helper to read/write objects using Jackson TOML.
src/test/java/land/oras/utils/TomlUtilsTest.java	Adds unit tests for TOML parsing/serialization.
src/main/java/land/oras/auth/RegistriesConf.java	New loader/model for registries.conf (currently focused on unqualified-search-registries).
src/test/java/land/oras/auth/RegistriesConfTest.java	Tests reading unqualified-search-registries from $HOME/.config/....
src/main/java/land/oras/Registry.java	Loads RegistriesConf and refactors calls to use resolved ContainerRef for registry-scoped operations; adds helper cloning.
src/main/java/land/oras/ContainerRef.java	Adds effective registry resolution using unqualified-search-registries and modifies toString() for unqualified refs.
src/test/java/land/oras/ContainerRefTest.java	Adds tests for effective registry resolution with/without unqualified settings.
src/test/java/land/oras/DockerIoITCase.java	Splits/adjusts IT cases and updates blob fetch to use effective registry.
src/test/java/land/oras/auth/AuthStoreTest.java	Removes a redundant test and adds class Javadoc.
pom.xml	Adds jackson-dataformat-toml dependency (version via imported Jackson BOM).

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 9 comments.

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