This app can be installed in repositories to replace the need of a Personal Access Token called GhTokenWorkflow.
You need to download the private key and create a json secret called GhTokenWorkflow in the organization (or repository) with the following properties: GitHubAppClientId and PrivateKey

You can use this code to create the secret content:

$apptoken = @{ "GitHubAppClientId" = 'Iv23lihcf5GSPGyQG4UU'; "PrivateKey" = ([System.IO.File]::ReadAllLines("<path-to-private-key.pem>") -join '') } | ConvertTo-Json -Compress -Depth 99