[FEAT]: Update github_app_installation_repositories for new backend GitHub API #3709

Describe the need

The docs for github_app_installation_repositories mention that "This resource is not compatible with the GitHub App Installation authentication method."

However, in a recent update, GitHub mentions there are updates to the API:

The Add a repository to an installation organization-level API and its corresponding removal API now support GitHub Apps and fine-grained PATs. Previously, these APIs only supported the coarse-grained repo scope.

These APIs support a new repository-level fine-grained permission:installation_repositories:write. Having this permission on a repository allows the caller to add or remove that repository from any installation in the organization. If the caller is a user, they must also be an organization owner or an administrator on the repository in question.

I immediately tried to use the resource with GitHub App authentication, but Terraform complains with "403 Resource not accessible by integration []".

Is it right in assuming that the provider would need to be updated to support this?

GitHub Installation Type

• GitHub.com (Free, Pro, or Team)
• GitHub Enterprise Server (on-premises)
• GitHub Enterprise Cloud with Personal Accounts (github.com)
• GitHub Enterprise Cloud with Managed Users/EMU (github.com)
• GitHub Enterprise Cloud with Data Residency (*.ghe.com)
• I don't know

Relevant log output

Code of Conduct

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