Add explicit bareRepository configuration when pushing bare mirror

[jdknight]

Why:

Was following the instructions outlined in Detaching a fork and noticed that step 5 was failing for me.

What's being changed (if available, include any code snippets, screenshots, or gifs):

If a user has configured bareRepository=explicit in their configuration, the push operation in this example will fail with the message:

fatal: cannot use bare repository '<path>.git' (safe.bareRepository is 'explicit')

By adding -c "safe.bareRepository=all" to the default instruction set, this should prevent issues for users who have bareRepository configured.

Check off the following:

• I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• For content changes, I have completed the self-review checklist.

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[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
pull-requests/collaborating-with-pull-requests/working-with-forks/detaching-a-fork.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@jdknight Thanks so much for opening a PR! I'll get this triaged for review ✨

[github-actions]

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