[Docs] Update External CI/CD guide

[mhdcodes]

Summary

I have added an extra step to install pnpm, as the action fails to install wrangler without.

Screenshots (optional)

Documentation checklist

[hyperlint-ai-deprecated]

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PR Change Summary

Added an extra step to install pnpm in the GitHub Actions documentation to ensure successful installation of wrangler.

• Added pnpm installation step to the GitHub Actions workflow
• Updated action version for pnpm setup
• Ensured compatibility for wrangler installation

Modified Files

• src/content/docs/workers/ci-cd/external-cicd/github-actions.mdx

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[kodster28]

Can you provide more details about the error messages you're seeing?

From my testing, I see some warnings around specific wrangler installations without the pnpm... but that doesn't prevent Wrangler from being installed.