ci: Add GitHub Pages deployment workflow

.github/workflows/deploy-pages.yaml

@@ -0,0 +1,48 @@
+name: 05 Deliver for GitHub Pages
+
+run-name: Deliver for GitHub Pages via ${{ (vars.RUNS_ON_SELF_HOSTED == null && '(on GitHub-hosted)') || '(on self-hosted)' }}
+
+on:
+  workflow_dispatch:
+
+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-pages:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/configure-pages@v5
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: ${{ (vars.FLUTTER_VERSION != null && vars.FLUTTER_VERSION) || '' }}
+          channel: stable
+          cache: ${{ (vars.RUNS_ON_SELF_HOSTED == null && true) || false }}
+
+      - run: |
+          make build-runner 
+          flutter pub get
+          flutter build web --base-href /buzz_recipe_viewer/
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/web
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4