How to obtain a token that is scoped to allow the installation of a GitHub App

[lukehinds]

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I am developing GitHub app, and rather then have the user visit https://github.com/app/my-github-app/installations/new and select which repositories they want to install the app in. I would prefer to handle this myself in my own app. The user grants my application an access token using OAuth2, I then use that token to add my app to the repository.

My initial approach was to get an access token via an OAuth App which scopes of "admin:user", "read:user", "admin:org", "read:org". I would then use this token to install a repository as shown here, but this does not work.

PUT https://api.github.com/user/installations/{my-app-id}/repositories/{repository-id}: 403 You do not have permission to modify this app on {github-username}

It appears you can only use a PAT token to add a repository

I then found the following Generating an installation access token for a GitHub App

But it appears this only works after an installation is already in place.

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