Cathy Theys developed a manual deployment workflow for Pantheon review apps in the Lullabot/drainpipe repository, focusing on improving deployment governance and control. She refactored the existing CI/CD pipeline using GitHub Actions and YAML to support both manual and automated deployment modes, introducing label-triggered deployments to ensure multidev environments are only created when explicitly requested. This approach reduced the risk of unintended deployments and enhanced traceability within the development process. By leveraging her expertise in DevOps and PHP, Cathy aligned deployment workflows with mainline changes, resulting in a more flexible and predictable process for managing Pantheon environments from pull requests.