Build JavaScript in docker build step

Author: Flo0807

.github/workflows/ci.yml

@@ -272,6 +272,19 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
+      - name: Setup node
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: 20
+          cache: 'yarn'
+          cache-dependency-path: yarn.lock
+
+      - name: Install node dependencies
+        run: yarn install --pure-lockfile
+
+      - name: Build JavaScript
+        run: yarn run build
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1