docs: add the description about variants

[suzuki-shunsuke]

Summary by CodeRabbit

• Documentation
  • Added comprehensive documentation for the new variants field in registry configuration overrides, enabling additional match conditions based on runtime-detected values.
  • Detailed support for the libc variant with runtime detection semantics and environment variable override capability.
  • Included backward-compatibility guidance and illustrative configuration examples.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 55b905e0-7f46-44e9-aea4-eceff9f57c9e

📥 Commits

Reviewing files that changed from the base of the PR and between 15633fa and 66f9cdc.

📒 Files selected for processing (1)

• website/docs/reference/registry-config/overrides.md

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📝 Walkthrough

Walkthrough

A new variants field is documented for the overrides configuration, enabling additional match conditions based on aqua runtime-detected key/value pairs. Documentation includes support for the libc variant key, environment variable overrides, backward-compatibility guidance for older aqua versions, and usage examples.

Changes

Cohort / File(s)	Summary
Registry Configuration Documentation website/docs/reference/registry-config/overrides.md	Adds comprehensive documentation for the variants field in overrides, including runtime detection semantics for libc, environment variable overrides, backward-compatibility notes for pre-v2.58.0 versions, and illustrative examples with matching rules recap.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰✨ A field called variants hops into view,
With libc detection and overrides too!
Runtime values matched with care,
Backward-compat guidance everywhere,
Documentation now complete and true! 📚

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is entirely empty, missing all required sections from the template including the contribution checklist, issue link, and commit signing confirmation.	Add a complete pull request description using the provided template, including the checklist items, link to the related GitHub issue, and confirmation that commits are signed.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs: add the description about variants' clearly describes the main change - adding documentation about a new variants field in registry overrides configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-variants

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