Add missing ecosystems to automatic GitHub Packages auth

[JamieMagee]

Gradle, bun, docker_compose, and devcontainers were missing from getPackagesCredential(). Gradle and bun reuse the Maven and npm handlers respectively (same registry hosts). docker_compose and devcontainers reuse the Docker handler (ghcr.io).

Includes tests for all new ecosystems.

[Copilot]

Pull request overview

This PR expands getPackagesCredential() to automatically add GitHub Packages credentials for additional Dependabot ecosystems that share existing registry handlers (Docker, Maven, npm).

Changes:

• Treat docker_compose and devcontainers as Docker ecosystems for GHCR (ghcr.io) auth.
• Treat gradle as a Maven ecosystem for GitHub Maven Packages auth.
• Treat bun as an npm ecosystem for GitHub npm Packages auth, and add tests for the new ecosystems.

Show a summary per file

File	Description
src/main.ts	Adds switch cases so the new ecosystems reuse the existing Docker/Maven/npm credential builders.
dist/main/index.js	Updates the compiled bundle to include the new ecosystem cases.
__tests__/main.test.ts	Adds test coverage for credential creation + duplicate prevention for the new ecosystems.

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• Files reviewed: 2/4 changed files
• Comments generated: 0