Tests

Add demo workflow #3860

Job	Run time
Build (ubuntu-latest, linux)	2m 3s
Tidy Go Modules	23s
Build (windows-latest, windows)	6m 28s
Build (macos-latest, macos)	1m 26s
Docker Lint	19s
[k3s] demo-helmfile	43s
[localstack] demo-localstack	2m 27s
[lint] demo-context	6s
[lint] quick-start-advanced	11s
Acceptance Tests (ubuntu-latest, linux)	3m 13s
[mock-linux] examples/demo-atlantis	5s
[validate] demo-context	4s
[mock-linux] examples/demo-component-versions	12s
[validate] demo-localstack	4s
[mock-linux] examples/demo-context	16s
Acceptance Tests (windows-latest, windows)	8m 7s
[validate] demo-stacks	4s
[mock-linux] examples/demo-vendoring	19s
Acceptance Tests (macos-latest, macos)	2m 57s
[validate] demo-helmfile	4s
[mock-linux] tests/fixtures/scenarios/complete	17s
[validate] quick-start-advanced	4s
[mock-windows] examples/demo-atlantis	17s
[validate] quick-start-simple	5s
[mock-windows] examples/demo-component-versions	50s
[mock-windows] examples/demo-context	26s
[mock-windows] examples/demo-vendoring	44s
[mock-windows] tests/fixtures/scenarios/complete	57s
[mock-macos] examples/demo-atlantis	16s
[mock-macos] examples/demo-component-versions	19s
[mock-macos] examples/demo-context	18s
[mock-macos] examples/demo-vendoring	26s
[mock-macos] tests/fixtures/scenarios/complete	30s
release	0s
	35m 0s

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