Add a demo for using arena CLI in container.

samples/cli/use-in-container/Dockerfile

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+FROM ubuntu:22.04
+
+RUN apt update && apt install -y wget
+
+RUN wget https://github.com/kubeflow/arena/releases/download/v0.9.15/arena-installer-0.9.15-f31e1b0-linux-amd64.tar.gz && \
+    tar -xvf arena-installer-0.9.15-f31e1b0-linux-amd64.tar.gz && \
+    cd arena-installer && \
+    bash install.sh --only-binary

samples/cli/use-in-container/README.md

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+## Use arena CLI in container
+
+This repository is a demo of using the arena CLI in container.
+
+1. Build arena CLI image
+```shell
+docker build -t arena-demo:test -f Dockerfile .
+```
+
+2. Create rbac for arena
+```shell
+kubectl create -f rbac.yaml
+```
+
+3. Create arena CLI deployment
+```shell
+kubectl create -f deployment.yaml
+```
+
+4. Execute arena CLI in container
+```shell
+kubectl exec -it arena-demo-57f7b467f9-p48ph -- arena version
+```

samples/cli/use-in-container/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: arena-demo
+  labels:
+    app: arena-demo
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: arena-demo
+  template:
+    metadata:
+      labels:
+        app: arena-demo
+    spec:
+      containers:
+      - name: arena-demo
+        image: arena-demo:test # replace it with your exactly <image_name:tags>
+        command:
+        - bash
+        - -c
+        - sleep infinity
+        resources:
+          requests:
+            cpu: 1
+            memory: 2Gi
+      serviceAccountName: arena-demo

samples/cli/use-in-container/rbac.yaml

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+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: arena-demo
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  - nodes
+  - persistentvolumes
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - apiextensions.k8s.io
+  resources:
+  - customresourcedefinitions
+  verbs:
+  - list
+  - get
+- apiGroups:
+  - ""
+  - apps
+  - extensions
+  resources:
+  - deployments
+  - replicasets
+  - statefulsets
+  - configmaps
+  - services
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - batch
+  resources:
+  - jobs
+  verbs:
+  - list
+  - get
+  - watch
+- apiGroups:
+  - kubeflow.org
+  resources:
+  - tfjobs
+  - mpijobs
+  - pytorchjobs
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - kai.alibabacloud.com
+  resources:
+  - trainingjobs
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - sparkoperator.k8s.io
+  resources:
+  - sparkapplications
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - batch.volcano.sh
+  resources:
+  - jobs
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - scheduling.sigs.k8s.io
+  resources:
+  - elasticquotas
+  - elasticquotatrees
+  verbs:
+  - list
+  - watch
+  - get
+- apiGroups:
+  - serving.kserve.io
+  resources:
+  - inferenceservices
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
+  - watch
+- apiGroups:
+  - authentication.k8s.io
+  resources:
+  - tokenreviews
+  verbs:
+  - create
+- apiGroups:
+  - ""
+  resources:
+  - namespaces
+  verbs:
+  - get
+
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    app: arena-demo
+  name: arena-demo
+
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  labels:
+    app: arena-demo
+  name: arena-demo
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: arena-demo
+subjects:
+- kind: ServiceAccount
+  name: arena-demo
+  namespace: default