fix/update_cicd

Author: europanite

.github/workflows/docker.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       - name: Run tests via docker-compose (deterministic CI)
         run: |
           docker compose -f docker-compose.test.yml up --build --exit-code-from frontend_test