YAML multi-line string

https://rancher.com/docs/rke/v0.1.x/en/config-options/add-ons/user-defined-add-ons/


To define an add-on directly in the YAML file, make sure to use the YAML’s block indicator

|-

as the addons directive is a multi-line string option. It’s possible to specify multiple YAML resource definitions by separating them using the

---

directive.