The Wayback Machine - https://web.archive.org/web/20220528005110/https://docs.github.com/en/actions/creating-actions

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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