fix(ci): use docker driver for buildx to avoid Docker Hub auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -53,6 +53,8 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker
 
       - name: Build images
         run: docker compose -f cicd/docker/docker-compose.yml build