test workspaces build

Author: iOvergaard

.github/workflows/build_test.yml

@@ -40,6 +40,7 @@ jobs:
       - run: npm ci --no-audit --no-fund --prefer-offline
       - run: npm run lint:errors
       - run: npm run build
+      - run: npm run build:workspaces
       - run: npm run check:paths
       - run: npm run generate:jsonschema:dist
       - run: npx playwright install --with-deps