Improvement/GitHub registry authentication

[mshojaei-txfusion]

Description

Add authentication support for GitHub registry access. This enhancement allows the registry to make authenticated requests to GitHub's API using a personal access token, which helps avoid rate limiting issues and enables access to private repositories. The implementation includes:

• Added authToken option to GithubRegistry configuration
• Updated API request headers to include authentication when token is provided
• Added test environment configuration
• Enhanced test coverage for authenticated scenarios
• Added proper error handling for API rate limits

Related Issues

hyperlane-xyz/hyperlane-monorepo#5501

Backward compatibility

Yes. This change is fully backward compatible as:

1. The authToken parameter is optional
2. The existing functionality remains unchanged when no authentication is provided
3. All existing methods maintain their current signatures and behavior

Testing

• Added new unit tests to verify authenticated API calls
• Tested rate limit handling with and without authentication
• Verified existing registry functionality remains intact
• All tests passing in the test environment with both authenticated and unauthenticated scenarios

[changeset-bot]

🦋 Changeset detected

Latest commit: 7e4837e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@hyperlane-xyz/registry	Minor

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