feat(argocd-apps): Add ArgoCD ApplicationSet (#1521)

* Add ArgoCD ApplicationSet

Signed-off-by: toyamagu <toyamagu2021@gmail.com>
Signed-off-by: Petr Drastil <petr.drastil@gmail.com>
Co-authored-by: Petr Drastil <petr.drastil@gmail.com>

charts/argocd-apps/ci/applicationsets-values.yaml

@@ -0,0 +1,45 @@
+# Test with applicationsets
+
+applicationsets:
+- name: guestbook
+  namespace: default # Only for test purpose.
+  additionalLabels: {}
+  additionalAnnotations: {}
+  # See PR #10026 (ArgoCD v2.5 or later)
+  # goTemplate: false
+  generators:
+  - git:
+      repoURL: https://github.com/argoproj/argocd-example-apps.git
+      revision: HEAD
+      directories:
+      - path: guestbook
+      - path: kustomize-*
+  template:
+    metadata:
+      name: '{{path.basename}}'
+      labels: {}
+      annotations: {}
+    spec:
+      project: default
+      source:
+        repoURL: https://github.com/argoproj/argocd-example-apps.git
+        targetRevision: HEAD
+        path: '{{path}}'
+      destination:
+        server: https://kubernetes.default.svc
+        namespace: default
+      syncPolicy:
+        automated:
+          prune: false
+          selfHeal: false
+      ignoreDifferences:
+      - group: apps
+        kind: Deployment
+        jsonPointers:
+        - /spec/replicas
+      info:
+      - name: url
+        value: https://argoproj.github.io/
+  syncPolicy:
+    # Set Application finalizer
+    preserveResourcesOnDeletion: false