Update push-to-private.yml

.github/workflows/push-to-private.yml

@@ -23,7 +23,7 @@ jobs:
       run: |
         git config user.name "github-actions[bot]"
         git config user.email "github-actions[bot]@users.noreply.github.com"
-        git remote set-url private https://x-access-token:${{ secrets.MLX_TOKEN }}@github.com/ecmwf-lab/anemoi-datasets-private.git
+        git remote add private https://x-access-token:${{ secrets.MLX_TOKEN }}@github.com/ecmwf-lab/anemoi-datasets-private.git
         
     - name: Push changes to private repository
       run: |