Does anyone know where to find the source code for the GitHub App? I've found the various CI platform actions/tasks but not the GitHub App (https://github.com/apps/pulumi)

We have these in a private repo.

I see, thanks. In that case is there anything I can do to debug an issue with it not working?

I think you can raise an issue at https://github.com/pulumi/service-requests about it. The github app is part of the pulumi service app. Someone from the service team can hopefully give more help about it.

Thanks @echoing-dinner-19531 that explains why it's private! I'll raise an issue there