Tests

Add support to load config values and secrets from external sources #2619

Job	Run time
Build	3m 17s
Docker Lint	24s
[lint] demo-context	11s
[k3s] demo-helmfile	40s
[localstack] demo-localstack	2m 25s
[mock] demo-atlantis	13s
Acceptance Tests	1m 33s
[mock] demo-component-versions	10s
[validate] demo-context	7s
[validate] demo-localstack	4s
[mock] demo-context	10s
[mock] demo-vendoring	20s
[validate] demo-stacks	6s
[validate] demo-helmfile	6s
[validate] quick-start-advanced	5s
[validate] quick-start-simple	5s
release	0s
	9m 56s

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