add qemu for release builds

Author: djeebus

.github/workflows/on_release.yaml

@@ -65,6 +65,9 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Build and push the Docker image
         run: |
           ./earthly \