Check Repo Key for Flat Repositories for valid gpg content #56
Description
in /etc/berrymill/berrymill.conf, if the URL for flat repositories is wrong, berrymill will not detect this.
It will try to download a key and write it. However it will get an error response from the server and write this html response thinking its a key.... Kiwi will then try to use this "fake key" and complain that it is no valid gpg data.
Fix: Check the downloaded key for valid gpg data before proceeding with writing the key
https://github.com/isbm/berrymill/blob/main/src/berry_mill/kiwrap.py#L88