Added buildx as it's required for building on windows

Author: zZHorizonZz

.github/workflows/build-test-windows.yml

@@ -34,6 +34,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build image
         uses: docker/build-push-action@v6
         with: