ci: define gh action to build and deploy app

.github/workflows/build-and-deploy.yml

@@ -0,0 +1,38 @@
+name: Build and deploy
+run-name: Build and deploy app on GitHub Pages
+on:
+  push:
+    branches:
+      - main
+jobs:
+  build-app:
+    runs-on: ubuntu-latest
+    steps:
+      - run: >
+          echo "Build triggered by commit \"{{ github.event.head_commit.message }}\"
+          ({{ github.event.head_commit.id }}) by \"{{ github.event.head_commit.author }}\""
+      - run: echo "Building on ${{ runner.os }}..."
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20
+      - name: Install app dependencies
+        run: npm install
+      - name: Build app with Webpack
+        run: npm run build
+      - name: Setup GitHub Pages
+        uses: actions/configure-pages@v5
+      - name: Upload artifact on GitHub Pages
+        uses: actions/upload-pages-artifact@v3
+  deploy-app:
+    runs-on: ubuntu-latest
+    needs: build-app
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy app to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4