CI: use Blacksmith docker builder in install smoke

.github/workflows/install-smoke.yml

@@ -44,10 +44,14 @@ jobs:
         with:
           pnpm-version: "10.23.0"
           cache-key-suffix: "node22"
+          use-sticky-disk: "true"
 
       - name: Install pnpm deps (minimal)
         run: pnpm install --ignore-scripts --frozen-lockfile
 
+      - name: Set up Docker Builder
+        uses: useblacksmith/setup-docker-builder@v1
+
       - name: Run root Dockerfile CLI smoke
         run: |
           docker build -t openclaw-dockerfile-smoke:local -f Dockerfile .