Hi, there's no published Docker version of Portofino, in part because it might be confusing to users (Portofino stores the application on the file system; with a Docker image, you'd have to mount a volume to keep your code/data across runs).
However, when you build an application with a recent version of Portofino, and enable the "docker" Maven profile, you'll get a few Docker images that compose your application – some are for use during development, but one contains the application and can be deployed as-is. The only documentation so far lies in the pom.xml file and Docker files of generated applications, and in the demo-tt application that's part of the source code of Portofino on GitHub.