config.yml

#! some variables need to be configurable externally
#! we can specify them in a separate file or a separate
#! YAML document node

#@ load("@ytt:data", "data")

jobs:
#@ for/end iaas in data.values.iaases:
- name: #@ "create-" + iaas.name
- name: #@ "destroy-" + iaas.name

values.yml

#@data/values
---
iaases:
- name: gcp
- name: aws