Mention how to handle GitHub Container Registry when using gh actions-importer configure

[jsoref]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/migrating-to-github-actions/automated-migrations/migrating-from-circleci-with-github-actions-importer#configuring-credentials

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

There's a block that suggests the experience will look like this:

$ gh actions-importer configure
✔ Which CI providers are you configuring?: CircleCI
Enter the following values (leave empty to omit):
✔ Personal access token for GitHub: ***************
✔ Base url of the GitHub instance: https://github.com
✔ Personal access token for CircleCI: ********************
✔ Base url of the CircleCI instance: https://circleci.com
✔ CircleCI organization name: mycircleciorganization
Environment variables successfully updated.

When I ran it, I saw something closer to this:

% gh actions-importer configure
✔ Which CI providers are you configuring?: CircleCI
Enter the following values (leave empty to omit):
✔ GitHub handle used to authenticate with the GitHub Container Registry:
✔ Personal access token to authenticate with the GitHub Container Registry:
✔ Personal access token for GitHub:
✔ Base url of the GitHub instance: https://github.com
✔ Personal access token for CircleCI:
✔ Base url of the CircleCI instance: https://circleci.com
✔ CircleCI organization name: mycircleciorganization
Environment variables successfully updated.

There's a section before that block that talks about each of the questions and how to prepare answers for them, it includes:

Create a GitHub personal access token (classic). For more information, see "Managing your personal access tokens."

Your token must have the workflow scope.

It should have a step for setting up a GHCR credential too.

Additional information

No response

[nguyenalex836]

@jsoref Thanks for opening an issue! I'll get this triaged for review ✨

[github-actions]

Thanks for opening an issue! We've triaged this issue for technical review by a subject matter expert 👀