Fix Pagefind build: copy _site to writable directory (#175)

The jekyll-build-pages Docker action creates _site with root ownership,
causing Pagefind to fail with permission denied. Copy to a writable
directory, run Pagefind there, then replace the original.

Co-authored-by: darnjo <josh@reso.org>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

.github/workflows/pages.yml

@@ -80,7 +80,11 @@ jobs:
           destination: ./_site
 
       - name: Build search index with Pagefind
-        run: npx pagefind --site ./_site
+        run: |
+          cp -r ./_site ./_site_writable
+          npx pagefind --site ./_site_writable
+          rm -rf ./_site
+          mv ./_site_writable ./_site
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3