Refactor release-next.yaml to use Dockerfile.arm64 for linux/aarch64 platform

Author: andrasbacsai

.github/workflows/release-next.yaml

@@ -70,7 +70,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          file: Dockerfile
+          file: Dockerfile.arm64
           platforms: linux/aarch64
           push: true
           tags: |