Copilot CLI no longer needs a personal access token in GitHub Actions

Short summary

GitHub Copilot CLI now supports GitHub Actions' built-in GITHUB_TOKEN for authentication, eliminating the need for personal access tokens. This simplifies credential management and security overhead in CI/CD workflows. Developers using Copilot in Actions can remove PAT setup immediately.

• •Built-in GITHUB_TOKEN now works with Copilot CLI in GitHub Actions
• •Removes need to create and manage personal access tokens
• •Improves security posture by reducing credential surface area

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