Actions Doc: Using actions from private repositories

[bradynpoulsen]

What article on docs.github.com is affected?

Actions > References > Workflow syntax > jobs.<job_id>.steps[*].uses

https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstepsuses

What part(s) of the article would you like to see updated?

Adding an example for using actions from private repositories by documenting the private repo must be cloned first.

Additional information

This documentation is the workflow that I use when needing to reference separate actions for internal processes.

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