gh-pages: add deployment workflow

Author: benno5020

.github/workflows/publish-website.yml

@@ -0,0 +1,51 @@
+name: Deploy gh-pages branch to GitHub Pages
+
+on:
+  push:
+    branches: ["gh-pages"]
+
+  # Allows us to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      
+      - name: Install PHP
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y php
+
+      - name: Generate /phars/index.html
+        run: |
+          php build/generate_phars_list.php
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './src'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4