ci: modernize deployment workflow to use github actions pages

Author: cboettig

.github/workflows/deploy.yml

@@ -4,6 +4,18 @@ on:
   push:
     branches:
       - master
+  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.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
 
 jobs:
   build:
@@ -12,8 +24,8 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          submodules: true  # Fetch Hugo themes (true OR recursive)
-          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
+          submodules: true
+          fetch-depth: 0
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
@@ -24,14 +36,18 @@ jobs:
       - name: Build
         run: hugo --minify
 
-      - name: Deploy
-        run: |
-          git config --global user.name "github-actions[bot]"
-          git config --global user.email "github-actions[bot]@users.noreply.github.com"
-          git add docs/
-          if git diff --staged --quiet; then
-            echo "No changes to commit"
-            exit 0
-          fi
-          git commit -m "Deploy to docs/ [skip ci]"
-          git push
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./docs
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4