Fix Docker build: add setup-buildx-action for push

.github/workflows/docker.yml

@@ -11,6 +11,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - uses: docker/setup-buildx-action@v3
+
       - uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}