docs/data/reusables/actions/arc-app-post-install-steps.md

1. After creating the {% data variables.product.prodname_github_app %}, on the {% data variables.product.prodname_github_app %}'s page, note the value for "App ID". You will use this value later.
2. Under "Private keys", click Generate a private key, and save the .pem file. You will use this key later.