wtf is gha-composite-action?

This repo provides a simple composite GitHub Action, but the README is extremely sparse and doesn't explain what the action actually does. In general, a composite action in GitHub is a way to bundle a sequence of automated steps into a single, reusable unit. Think of it as a macro or a shortcut: instead of writing out the same five commands every time you set up a new project's automation, you package them once and then call that package with a single line wherever you need it. At a high level, composite actions work by combining multiple steps, like shell commands or other actions, into one block. When your automation runs, it treats that entire block as one step. This is useful for keeping configuration files clean and avoiding duplication, especially if you maintain multiple projects that share common setup or teardown tasks. Someone who would use this is a developer or team lead who works with GitHub's automation features and finds themselves repeating the same sequences across different projects. For example, if every project needs to check out code, install dependencies, and run a formatting check in the same order, a composite action lets you define that flow once and reuse it. However, because the README doesn't specify what particular steps this action combines, it's hard to say exactly what scenario it's built for. The project is licensed under the ISC License, which is a permissive open-source license. Beyond that, the README doesn't go into detail about the action's internals, intended use case, or how to integrate it. Anyone considering using it would need to look at the actual code files in the repository to understand what it does and whether it fits their needs.