Use ssh-key to enforce SSH remote for pushing

.github/workflows/test.yml

@@ -30,6 +30,7 @@ jobs:
     - uses: actions/checkout@main
       with:
         ref: ${{ github.event.inputs.ref }}
+        ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
     # Required for Upload doc step
     - name: Setup git config
       run: |