[ci] use host buildx config

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

.github/workflows/pull-requests.yaml

@@ -27,6 +27,9 @@ jobs:
           fetch-depth: 0
           fetch-tags: true
 
+      - name: Set up Docker config
+        run: cp -r ~/.docker ${{ runner.temp }}/.docker
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with: