Create gatsby.yml

[Fervv268]

What kind of change does this PR introduce?

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Summary

Does this PR introduce a breaking change?

Other information

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[Copilot]

Pull Request Overview

This PR introduces a GitHub Actions workflow for automatically building and deploying a Gatsby site to GitHub Pages. The workflow includes automatic package manager detection, caching for build optimization, and deployment configuration.

• Adds automated CI/CD pipeline for Gatsby site deployment
• Implements package manager auto-detection (yarn/npm)
• Configures build caching and GitHub Pages deployment

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