Updates the deploy-docs.yml workflow to publish documentation to the external fluentmigrator/fluentmigrator.github.io repository instead of the current repository's GitHub Pages.

Changes

• Replace GitHub Pages deployment actions with peaceiris/actions-gh-pages@v4 configured for external repository deployment
• Update permissions from pages: write, id-token: write to contents: write for cross-repository push access
• Configure deployment target: fluentmigrator/fluentmigrator.github.io repository, main branch
• Use deploy_key with secrets.ACTIONS_DEPLOY_KEY for authentication (required for external repository deployment)

Configuration

- name: Deploy to GitHub Pages
  uses: peaceiris/actions-gh-pages@v4
  with:
    deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
    publish_dir: ./docs-website/.vitepress/dist
    external_repository: fluentmigrator/fluentmigrator.github.io
    publish_branch: main

Setup Required

A deploy key must be generated and configured:

1. Generate SSH key pair: ssh-keygen -t ed25519 -C "github-actions-deploy"
2. Add the public key as a deploy key in the fluentmigrator/fluentmigrator.github.io repository (Settings → Deploy keys → Add deploy key, with write access enabled)
3. Add the private key as a secret named ACTIONS_DEPLOY_KEY in this repository (Settings → Secrets and variables → Actions → New repository secret)

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