Google Cloud Print doesn't work in CUPS container

[mnbf9rca]

looking at https://github.com/gfjardim/docker-containers/blob/master/cups/generate_cloudprint_config.py, it appears to call https://www.google.com/accounts/ClientLogin - but this has been disabled for 4 years now (see https://developers.google.com/identity/protocols/AuthForInstalledApps).