fix(copilot-cli): wrap GITHUB_TOKEN expression in raw tags

[jonigl]

Before (rendered): GITHUB_TOKEN: $ (check https://docs.github.com/en/copilot/how-tos/copilot-cli/use-copilot-cli-in-actions)

After (rendered): GITHUB_TOKEN: ${{ github.token }}

Docs-only change, no content or behavior changes beyond the fix.

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• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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[Copilot]

Pull request overview

Fixes Liquid rendering so the workflow example displays the complete GITHUB_TOKEN expression.

Changes:

• Wraps ${{ github.token }} in Liquid raw tags.

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[subatoi]

Thank you very much, @jonigl! I'll get this merged now 🙇

[jonigl]

Thank you very much, @jonigl! I'll get this merged now 🙇

Thanks @subatoi for the quick review! 🙂