add webapp build to docker pipeline

.github/workflows/docker-build-and-publish.yaml

@@ -22,6 +22,10 @@ env:
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x]
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -32,6 +36,30 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Cache node modules
+        id: cache-npm
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-node-modules
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Build webapp
+        run: |
+          cd webapp
+          npm ci
+          npm run build
+
       - uses: actions/setup-python@v5
         with:
           python-version: "3.9"