Also upload hidden files into artifacts

.forgejo/workflows/build-jekyll.yml

@@ -10,6 +10,8 @@ jobs:
       - run: bundle exec jekyll build
       - uses: actions/upload-artifact@v3
         with:
+          compression-level: 9
+          include-hidden-files: true
           name: generated-site
           path: _site/
   build_and_push_container: