feat: add the start of an example deploy repo for testing and validation

This internal deploy repo example can be used to validate our tools
against a deploy repo and can be used to stand up a test environment for
other validations.

Author: cardoe

examples/deploy-repo/README.md

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+# deploy-repo
+
+This is an example of a Deployment Repo per the documentation.
+
+It defines all 3 environment types:
+
+- Management
+- Global
+- Site
+
+The Management is in the `mgmt` directory. The Global is in the
+`global` directory. With one Site in `site`.
+
+## Quick Test
+
+The following will stand up 3 test clusters.
+
+```bash
+./scripts/e2e-test-setup.sh setup
+```
+
+Then you can switch to the `mgmt` cluster.
+
+```bash
+kubectl ctx kind-mgmt
+```
+
+Then load the ArgoCD configuration.
+
+```bash
+kustomize build --load-restrictor LoadRestrictionsNone \
+  ./examples/deploy-repo/mgmt/apps/argocd/ \
+  | kubectl -n argocd apply -f -
+```
+
+Now get access to ArgoCD.
+
+```bash
+kubectl -n argocd get secret argocd-initial-admin-secret \
+  -o jsonpath='{.data.password}' | base64 -d
+```
+
+```bash
+kubectl port-forward svc/argocd-server -n argocd 8080:443
+```
+
+Go to <http://127.0.0.1:8080>

examples/deploy-repo/global/argocd-understack-values.yaml

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+global:
+  cilium:
+    enabled: false
+
+  openebs:
+    enabled: false
+
+  rook:
+    enabled: false
+
+site:
+  enabled: false

examples/deploy-repo/mgmt/apps/argocd/appset-of-understack.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: understack
+spec:
+  goTemplate: true
+  goTemplateOptions: ["missingkey=error"]
+  generators:
+  - clusters:
+      selector:
+        matchExpressions:
+          - key: understack.rackspace.com/role
+            operator: In
+            values:
+              - "global"
+              - "site"
+              - "aio"
+  template:
+    metadata:
+      name: '{{.name}}-understack'
+    spec:
+      project: default
+      sources:
+        - repoURL: https://github.com/rackerlabs/understack.git
+          targetRevision: HEAD
+          path: charts/argocd-understack
+          helm:
+            releaseName: '{{.name}}'
+            valueFiles:
+              - /examples/deploy-repo/{{.name}}/argocd-understack-values.yaml
+            valuesObject:
+              cluster_server: '{{.server}}'
+              deploy_url: https://github.com/rackerlabs/understack.git
+              deploy_ref: HEAD
+              deploy_path_prefix: 'examples/deploy-repo'
+      destination:
+        name: "in-cluster"
+        namespace: argocd
+      syncPolicy:
+        automated:
+          prune: false
+          selfHeal: false

examples/deploy-repo/mgmt/apps/argocd/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- ../../../../../apps/appsets/project-understack-infra.yaml
+- ../../../../../apps/appsets/project-understack-operators.yaml
+- ../../../../../apps/appsets/project-understack.yaml
+- appset-of-understack.yaml

examples/deploy-repo/site/argocd-understack-values.yaml

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+site:
+  rook:
+    enabled: false
+
+global:
+  enabled: false