Restore gh-pages workflow

This was dropped erroneously

Author: mbaldessari

.github/workflows/gh-pages.yml

@@ -0,0 +1,39 @@
+name: github pages
+
+on:
+  push:
+    branches:
+      - main  # Set a branch to deploy
+  pull_request:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          submodules: true  # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+
+      - run: gem install asciidoctor rouge
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v3
+        with:
+          hugo-version: '0.133.1'
+          extended: true
+
+      - name: Build
+        run: |
+          hugo --minify
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v4
+        if: github.ref == 'refs/heads/main'
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public