ntfy_topic()
uses theNTFY_TOPIC
env var to set the default topic.ntfy_server()
uses theNTFY_SERVER
env var to set the default server.ntfy_auth()
uses theNTFY_AUTH
env var to determine is authentication should be used.ntfy_username()
uses theNTFY_USERNAME
env var to set the default username.ntfy_password()
uses theNTFY_PASSWORD
env var to set the default password.