copy from idpbuilder example dir (#3)

Signed-off-by: Manabu McCloskey <manabu.mccloskey@gmail.com>

basic/README.md

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+
+## Basic Example
+
+This directory contains basic examples of using the custom package feature.
+
+### Local manifests
+
+The [package1 directory](./package1) is an example of a custom package that you have developed locally, and you want test.
+
+This configuration instructs idpbuilder to:
+
+1. Create a Gitea repository.
+2. Sync the contents of the [manifests](./package1/manifests) directory to the repository.
+3. Replace the `spec.Source(s).repoURL` field with the Gitea repository URL.
+
+### Remote manifests
+
+The [package2 directory](./package2) is an example for packages available remotely. This is applied directly to the cluster.

basic/package1/app.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: my-app
+  namespace: argocd
+  labels:
+    example: basic
+spec:
+  destination:
+    namespace: my-app
+    server: "https://kubernetes.default.svc"
+  source:
+    # cnoe:// indicates we want to sync from a local directory.
+    # values after cnoe:// is treated as a relative path from this file.
+    repoURL: cnoe://manifests
+    targetRevision: HEAD
+    # with path set to '.' and cnoe://manifests. we are wanting ArgoCD to sync from the ./manifests directory.
+    path: "."
+  project: default
+  syncPolicy:
+    automated:
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true

basic/package1/manifests/alpine.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: busybox
+  namespace: argocd
+  labels:
+    abc: ded
+    notused: remove-me
+spec:
+  containers:
+    - image: alpine:3.18
+      command:
+        - sleep
+        - "3600"
+      imagePullPolicy: IfNotPresent
+      name: busybox
+  restartPolicy: Always

basic/package2/app.yaml

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+# this is an ordinary ArgoCD application file
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: guestbook
+  namespace: argocd
+  labels:
+    example: basic
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/argoproj/argocd-example-apps.git
+    targetRevision: HEAD
+    path: guestbook
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: guestbook
+  syncPolicy:
+    automated:
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true

basic/package2/app2.yaml

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+# this is an ordinary ArgoCD application file
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: guestbook2
+  namespace: argocd
+  labels:
+    example: basic
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/argoproj/argocd-example-apps.git
+    targetRevision: HEAD
+    path: guestbook
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: guestbook2
+  syncPolicy:
+    automated:
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true