Customized to distinguish docker from host using the theme "robbyrussell". You can use the "ZSH_REMOTE" environment variable to tell if it's SSH or DOCKER, and you can use the "REMOTE_HOST" variable to modify the name!
($ZSH_REMOTE : $REMOTE_HOST)
Because you enter the prompt as above, you need to set the value of the environment variable. If there is no value of "ZSH_REMOTE", "Docker" will be entered.