Do not try to update github-pages on pull_request (#2711)

.github/workflows/github-pages.yml

@@ -31,11 +31,11 @@ jobs:
           sphinx-build docs _build
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v4
-      #  if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+        if: ${{ github.event_name != 'pull_request' }}
         with:
           publish_branch: gh-pages
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: _build/
           force_orphan: true
           enable_jekyll: false # This is required to preserve _static (and thus the theme)
-          cname: archinstall.archlinux.page
+          cname: archinstall.archlinux.page