The Ruby Agent's continuous integration workflow is designed to build all binary Ruby interpreters from version 2.0 to the current version and run test suites against each version, resulting in a test matrix of over 150 jobs. The agent uses GitHub Actions, which are single-purpose, reusable, and shareable actions that can be implemented as either pure JavaScript or with TypeScript. To get started with a JavaScript-based GitHub Actions script, it's recommended to take the simplest path first, building first and extracting later. This involves setting up a new repository for the action script, installing NodeJS, YARN, and ncc, and then creating an index.js file that defines the main entry function. The main entry function is defined as async, allowing it to run in a non-blocking, concurrent fashion. To capture the output of shell commands, a callback listener can be used. Additionally, annotations can be used to display information about failed jobs in summary form, providing a better debugging experience.