GenerateRandomString thanks to https://stackoverflow.com/a/31832326/6450189 GenerateRandomString is used to generate a random string that is used as a cluster token.

GetConfigDirOrCreate will return the base path of the k3d config directory or create it if it doesn't exist yet k3d's config directory will be $HOME/.k3d (Unix).

MapSubexpNames maps regex capturing group names to corresponding matches.