ci: update build command in GitHub Actions workflow to use recursive option

Author: fossamagna

.github/workflows/tests.yml

@@ -28,5 +28,5 @@ jobs:
           node-version: 20
           cache: "pnpm"
       - run: pnpm install -frozen-lockfile
-      - run: pnpm build
+      - run: pnpm --if-present --recursive build
       - run: pnpm test