Tests

Add demo workflow #3149

Job	Run time
Build (ubuntu-latest, linux)	24s
Build (windows-latest, windows)	6m 42s
Build (macos-latest, macos)	1m 4s
[k3s] demo-helmfile	31s
[localstack] demo-localstack	2m 21s
Docker Lint	18s
[lint] demo-context	7s
Acceptance Tests (ubuntu-latest, linux)	1m 15s
[lint] quick-start-advanced	7s
[mock-linux] demo-atlantis	7s
Acceptance Tests (windows-latest, windows)	8m 30s
[validate] demo-context	4s
[mock-linux] demo-component-versions	9s
Acceptance Tests (macos-latest, macos)	1m 34s
[validate] demo-localstack	3s
[mock-linux] demo-context	11s
[validate] demo-stacks	4s
[mock-linux] demo-vendoring	15s
[validate] demo-helmfile	3s
[mock-linux] tests	17s
[validate] quick-start-advanced	5s
[mock-windows] demo-atlantis	16s
[validate] quick-start-simple	4s
[mock-windows] demo-component-versions	22s
[mock-windows] demo-context	17s
[mock-windows] demo-vendoring	34s
[mock-windows] tests	45s
[mock-macos] demo-atlantis	12s
[mock-macos] demo-component-versions	14s
[mock-macos] demo-context	16s
[mock-macos] demo-vendoring	24s
[mock-macos] tests	28s
release	0s
	28m 3s

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