Rename authToken to apiKey and add configuration fallbacks

[pditommaso]

Summary

Rename the authToken property to apiKey for clearer semantics and add comprehensive configuration fallback support for both URL and API key settings.

Changes Made

Property Rename

• Renamed: authToken → apiKey across all registry configuration
• Updated files: RegistryPublishConfig, RegistryClient, RegistryUploadTask
• Reason: "API key" is more specific and semantically appropriate than "auth token"

Configuration Fallbacks

Added flexible configuration resolution with fallback priority:

Registry URL Resolution

1. nextflowPlugin.publishing.registry.url (explicit in build.gradle)
2. Gradle property: -Pnpr.apiUrl=https://custom-registry.com/api
3. Environment variable: NPR_API_URL=https://custom-registry.com/api
4. Default: https://plugin-registry.seqera.io/api

API Key Resolution

1. nextflowPlugin.publishing.registry.apiKey (explicit in build.gradle)
2. Gradle property: -Pnpr.apiKey=your-secret-key
3. Environment variable: NPR_API_KEY=your-secret-key
4. Error: Helpful message with all configuration options

Documentation Updates

• README: Added comprehensive "Registry Configuration" section
• Examples: gradle.properties and environment variable usage
• Task name: Updated releasePlugin → publishPlugin
• Default URL: Updated to plugin-registry.seqera.io/api

Testing

• Added: 8 new unit tests covering all fallback scenarios
• Coverage: URL resolution, API key resolution, error handling
• Results: All 11 tests passing (100% success rate)

Benefits

• Flexible configuration: Multiple ways to set registry URL and API key
• Secure defaults: API key requires explicit configuration
• Better UX: Clear error messages with configuration instructions
• CI/CD friendly: Environment variable support for automated builds
• Backward compatible: Existing explicit configurations still work
• Consistent naming: Both gradle properties follow npr.api* pattern

Example Usage

Using gradle.properties:

npr.apiUrl=https://my-custom-registry.com/api
npr.apiKey=secret-api-key-123

Using environment variables:

export NPR_API_URL=https://my-custom-registry.com/api
export NPR_API_KEY=secret-api-key-123
./gradlew publishPlugin

Mixed configuration:

nextflowPlugin {
    publishing {
        registry {
            // URL from env var, API key from gradle property
            // url defaults to plugin-registry.seqera.io/api
            apiKey = project.findProperty('npr.apiKey')
        }
    }
}

Configuration Properties

• Gradle properties: npr.apiUrl, npr.apiKey
• Environment variables: NPR_API_URL, NPR_API_KEY

Test Plan

• All existing functionality preserved
• URL fallback priority works correctly
• API key fallback priority works correctly
• Default URL used when none specified
• Clear error when API key missing
• All unit tests pass (11/11)

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