implement tests for demo-component-versions

examples/demo-component-versions/.gitignore

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+components/terraform/**

examples/demo-component-versions/atmos.yaml

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+# atmos.yaml CLI config
+base_path: "./"
+
+components:
+  terraform:
+    base_path: "components/terraform"
+    apply_auto_approve: false
+    deploy_run_init: true
+    init_run_reconfigure: true
+    auto_generate_backend_file: false
+
+stacks:
+  base_path: "stacks"
+  included_paths:
+    - "deploy/**/*"
+  excluded_paths:
+    - "**/_defaults.yaml"
+  name_pattern: "{stage}"
+
+logs:
+  file: "/dev/stderr"
+  level: Info
+
+commands:
+- name: "test"
+  description: "Run all tests"
+  steps:
+  - atmos vendor pull

examples/demo-component-versions/vendor.yaml

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+apiVersion: atmos/v1
+kind: AtmosVendorConfig
+metadata:
+  name: demo-yaml-anchors
+  description: Example of using YAML anchors with an Atmos vendoring manifest
+spec:
+  # Import other vendor manifests, if necessary
+  imports: []
+  bases:
+  - &library
+    source: "github.com/cloudposse/atmos.git//examples/demo-library/{{ .Component }}?ref={{.Version}}"
+    version: "reorg"
+    targets:
+      - "components/terraform/{{ .Component }}/{{.Version}}"
+    included_paths:
+      - "**/*.tf"
+      - "**/*.tfvars"
+      - "**/*.md"      
+    tags:
+      - demo
+
+  - &main
+    <<: *library
+    version: "main"
+
+  - &v1
+    <<: *library
+    version: "reorg"
+
+  sources:
+  - <<: *v1
+    component: "github/stargazers"
+
+  - <<: *v1
+    component: "weather"
+
+  - <<: *v1
+    component: "ipinfo"