The Wayback Machine - https://web.archive.org/web/20220526215304/https://docs.github.com/en/actions/creating-actions

Free, Pro, & Team

English

Creating actions

You can create your own actions, use and customize actions shared by the GitHub community, or write and share the actions you build.

About custom actions

Creating a Docker container action

Creating a JavaScript action

Creating a composite action

Metadata syntax for GitHub Actions

Dockerfile support for GitHub Actions

Setting exit codes for actions

Publishing actions in GitHub Marketplace

Releasing and maintaining actions

Developing a third party CLI action