feat: add nutanix csi

[faiq]

Adds nutanix CSI.

[jimmidyson]

I pushed some of the changes specifically around schema validation and updates to #10 - let me know what you think. Note that this requires the updated test utility in #9.

[faiq]

It looks like delivering the storage classes via cluster resource set is working.

01:52 PM  faiqus @ archlinux  ~/go/src/github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix  faiq/add-nutanix-csi⚡? 
$ kubectl get cm aws-storageclass-cm -o yaml
apiVersion: v1
data:
  custom-resources.yaml: |-
    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
      annotations:
        storageclass.kubernetes.io/is-default-class: "true"
      creationTimestamp: null
      name: aws-ebs
      namespace: default
    parameters:
      csi.storage.k8s.io/fstype: ext4
      encrypted: "true"
      type: gp3
    provisioner: aws-ebs
    reclaimPolicy: Delete
    volumeBindingMode: WaitForFirstConsumer
kind: ConfigMap
metadata:
  creationTimestamp: "2024-03-28T19:50:27Z"
  name: aws-storageclass-cm
  namespace: default
  ownerReferences:
  - apiVersion: addons.cluster.x-k8s.io/v1beta1
    kind: ClusterResourceSet
    name: aws-storageclass-crs
    uid: 5b37ccaf-7674-461e-aa01-a007c630500b
  resourceVersion: "3373"
  uid: b400598a-877e-4e84-97fa-d032dc91a287

01:53 PM  faiqus @ archlinux  ~/go/src/github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix  ⏎ 130  faiq/add-nutanix-csi⚡? 
$ clusterctl get kubeconfig dawginme7 >> dawg7.conf
Using configuration File="/home/faiqus/.cluster-api/clusterctl.yaml"
Using configuration File="/home/faiqus/.cluster-api/clusterctl.yaml"

01:53 PM  faiqus @ archlinux  ~/go/src/github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix  faiq/add-nutanix-csi⚡? 
$ kubectl --kubeconfig=dawg7.conf get sc
NAME                PROVISIONER   RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
aws-ebs (default)   aws-ebs       Delete          WaitForFirstConsumer   false                  3m30s

01:53 PM  faiqus @ archlinux  ~/go/src/github.com/d2iq-labs/cluster-api-runtime-extensions-nutanix  faiq/add-nutanix-csi⚡? 
$ kubectl --kubeconfig=dawg7.conf get po -n kube-system | grep csi
ebs-csi-controller-74fcb959f9-pdk62                                 6/6     Running   0          4m
ebs-csi-controller-74fcb959f9-rgt4m                                 6/6     Running   0          4m
ebs-csi-node-dq65g                                                  3/3     Running   0          3m10s
ebs-csi-node-q8tpn                                                  3/3     Running   0          3m59s

We can see that the storage class and the driver are configured on the workload cluster

changes made!