The ssh-private-key argument is empty. Maybe the secret has not been configured, or you are using a wrong secret name in your workflow file.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, webfactory/[email protected]. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.