Improve error handling

[fabapp2]

Running boot add web throws an HttpException when 'bad credentials' are provided. The error reported on console gives no hint about it.

Getting project from https://github.com/rd-1-2022/rest-service
Failed processing GitRepoUrlRef{repoUrl=https://github.com/rd-1-2022/rest-service, subPath='null', ref='null'}Disconnected from the target VM, address: '127.0.0.1:60822', transport: 'socket'

Process finished with exit code 1

[slava-lu]

How do you provide GitHub credentials at all to boot add? there no info in the docs.