GitHub PR Merge to Staging Deployment

## Setup Instructions
1. **GitHub Trigger**: Configure your repository owner and name. Ensure the webhook is active.
2. **Credentials**: Add your GitHub OAuth2, DigitalOcean (or other cloud provider) API key, and Slack Token.
3. **Deployment Logic**: The 'Deploy to Staging' node simulates a deployment via HTTP Request (e.g., to a CI/CD webhook or cloud API). Adjust the URL.
4. **Health Check**: The loop checks an endpoint until it returns 200 OK or times out.