* Support reading gh app key directly from env
Pass the app-key directly via GPC_GITHUB_APP_KEY env instead
of reading a file.
A file can still be used with the `app-key-file` flag.
* Fix error output for loading key file
Co-authored-by: Bernd Ahlers <bernd@users.noreply.github.com>
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Co-authored-by: Bernd Ahlers <bernd@users.noreply.github.com>
Disable the branch-protection command. We don't use it anymore and it's
now dangerous to use because it would override our manualy brancht
protection configuration.
