Update build-push-action to v6

Author: parkan

.github/workflows/container-publish.yml

@@ -56,7 +56,7 @@ jobs:
             type=ref,event=branch
             type=raw,value=${{ needs.prepare-checkout.outputs.ref }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           cache-from: type=gha