workflow to deploy the viewer app

Author: Erik Soehnel

.github/workflows/app.yml

@@ -0,0 +1,55 @@
+# Based on the github actions "static" template
+name: Deploy viewer app
+
+on:
+  # run if the app changed on master
+  push:
+    branches: ["master"]
+    paths: ["app/**", ".github/workflows/app.yml"]
+
+  # Allows you 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: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: 'npm'
+      - name: Install dependencies
+        run: |
+          cd app
+          npm ci
+      - name: Build
+        run: |
+          cd app
+          npm run build
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: app/dist
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4