DBAppName converts the app name to a database compatible name, eg: "My-app Name" -> "my_app_name".

EnvAppName converts the app name to an environment variable compatible name, eg: "My-app Name" -> "MY_APP_NAME".

RandString generates a random string of length len using the chars in letterRunes.

SanitizeAppName converts the app name to a github sanitized name, eg: "My_app@Name" -> "My-app-Name".