Release please vs. auto-publish

[Auto-publish](https://github.com/ubuntu-flutter-community/stdlibc.dart/blob/main/.github/workflows/publish.yaml) doesn't trigger on tags or releases by [release-please](https://github.com/google-github-actions/release-please-action).

> `release-please` requires a GitHub token to access the GitHub API. You configure this token via the
> `token` configuration option. You can use the built-in `GITHUB_TOKEN` secret, however, note that any resources
> created by `release-please` (release tag or release pull request) will not trigger future GitHub actions
> workflows.
>
> From the [docs](https://docs.github.com/en/actions/using-workflows/triggering-a-workflow#triggering-a-workflow-from-a-workflow):
>> When you use the repository's `GITHUB_TOKEN` to perform tasks, events triggered by the `GITHUB_TOKEN` will not create a new workflow run. This prevents you from accidentally creating recursive workflow runs.
>
> This means that GitHub actions CI checks will not run on the release pull request and workflows normally triggered by
> `release.created` events will also not run. You will want to configure a GitHub actions secret with a
> [personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token)
> if you want other workflows to run.

https://github.com/google-github-actions/release-please-action#github-credentials