Configure auto-merge and default permissions on a repository

[yaleman]

Allow for configuring auto-merge on a repository, it should be under the generic tests.

[yaleman]

... ugh, this relies on posting to a form because the REST API doesn't allow for it.

[yaleman]

You should be able to update this setting from the Update a repository endpoint. You'll pass that configuration using the allow_auto_merge parameter on the body of that request.

[yaleman]

The GitHub Actions bot should be able to merge pull requests if it has write permission on pull requests. If you need to grant write permissions to GitHub Actions workflow through the API, you can do that using the following endpoints(both organizational and repository level):

https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#set-default-workflow-permissions-for-an-organization

https://docs.github.com/en/rest/actions/permissions?apiVersion=2022-11-28#set-default-workflow-permissions-for-a-repository

[yaleman]

permissions is getting merged in #260