chore: Add build step in integration pipeline

.github/workflows/tests.yml

@@ -43,6 +43,8 @@ jobs:
         run: yarn --frozen-lockfile --unsafe-perm
       - name: Install dependencies playground
         run: yarn playground:install --frozen-lockfile --unsafe-perm
+      - name: Build playground
+        run: yarn playground:build
       - name: Run test
         run: yarn run -s test:integration
       - name: Upload coverage to Codecov