Add sample deployment/service account manifest

Based on https://notes.elmiko.dev/2020/05/22/kubernetes-autoscaler-capd.html

cluster-autoscaler/cloudprovider/clusterapi/README.md

@@ -60,3 +60,15 @@ use the group `cluster.x-k8s.io`, with a dynamically acquired version. In
 some situations, such as testing or prototyping, you may wish to change this
 group variable. For these situations you may use the environment variable
 `CAPI_GROUP` to change the group that the provider will use.
+
+## Sample manifest
+
+A sample manifest that will create a deployment running the autoscaler is
+available. It can be deployed by passing it through `envsubst`, providing
+these environment variables to set the namespace to deploy into as well as the image and tag to use:
+
+```
+export AUTOSCALER_NS=kube-system
+export AUTOSCALER_IMAGE=us.gcr.io/k8s-artifacts-prod/autoscaling/cluster-autoscaler:v1.18.1
+envsubst < examples/deployment.yaml | kubectl apply -f-
+```

cluster-autoscaler/cloudprovider/clusterapi/examples/deployment.yaml

@@ -0,0 +1,167 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: cluster-autoscaler
+  namespace: ${AUTOSCALER_NS}
+  labels:
+    app: cluster-autoscaler
+spec:
+  selector:
+    matchLabels:
+      app: cluster-autoscaler
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: cluster-autoscaler
+    spec:
+      containers:
+      - image: ${AUTOSCALER_IMAGE}
+        name: cluster-autoscaler
+        command:
+        - /cluster-autoscaler
+        args:
+        - --cloud-provider=clusterapi
+      serviceAccountName: cluster-autoscaler
+      terminationGracePeriodSeconds: 10
+      tolerations:
+      - effect: NoSchedule
+        key: node-role.kubernetes.io/master
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-autoscaler-workload
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-autoscaler-workload
+subjects:
+- kind: ServiceAccount
+  name: cluster-autoscaler
+  namespace: ${AUTOSCALER_NS}
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-autoscaler-management
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-autoscaler-management
+subjects:
+- kind: ServiceAccount
+  name: cluster-autoscaler
+  namespace: ${AUTOSCALER_NS}
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: cluster-autoscaler
+  namespace: ${AUTOSCALER_NS}
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-autoscaler-workload
+rules:
+  - apiGroups:
+    - ""
+    resources:
+    - persistentvolumeclaims
+    - persistentvolumes
+    - pods
+    - replicationcontrollers
+    verbs:
+    - get
+    - list
+    - watch
+  - apiGroups:
+    - ""
+    resources:
+    - nodes
+    verbs:
+    - get
+    - list
+    - update
+    - watch
+  - apiGroups:
+    - ""
+    resources:
+    - pods/eviction
+    verbs:
+    - create
+  - apiGroups:
+    - policy
+    resources:
+    - poddisruptionbudgets
+    verbs:
+    - list
+    - watch
+  - apiGroups:
+    - storage.k8s.io
+    resources:
+    - csinodes
+    - storageclasses
+    verbs:
+    - get
+    - list
+    - watch
+  - apiGroups:
+    - batch
+    resources:
+    - jobs
+    verbs:
+    - list
+    - watch
+  - apiGroups:
+    - apps
+    resources:
+    - daemonsets
+    - replicasets
+    - statefulsets
+    verbs:
+    - list
+    - watch
+  - apiGroups:
+    - ""
+    resources:
+    - events
+    verbs:
+    - create
+    - patch
+  - apiGroups:
+    - ""
+    resources:
+    - configmaps
+    verbs:
+    - create
+    - delete
+    - get
+    - update
+  - apiGroups:
+    - coordination.k8s.io
+    resources:
+    - leases
+    verbs:
+    - create
+    - get
+    - update
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-autoscaler-management
+rules:
+  - apiGroups:
+    - cluster.x-k8s.io
+    resources:
+    - machinedeployments
+    - machines
+    - machinesets
+    verbs:
+    - get
+    - list
+    - update
+    - watch