Move kustomize pattern to strategic merge;Fix regex patterns;Update description

ansible/roles/firstboot/files/ansible_payload/bootstrap/templates/kustomization.nodepool.j2

@@ -27,6 +27,17 @@ patchesStrategicMerge:
           mounts:
           - - LABEL=blockstorage
             - /mnt/blockstorage
+  - |-
+    apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+    kind: VSphereMachineTemplate
+    metadata:
+      name: {{ _template.cluster.name }}-worker
+      namespace: default
+    spec:
+      template:
+        spec:
+          additionalDisksGiB:
+          - {{ _template.nodepool.additionaldisk }}
 
 patchesJson6902:
   - target:
@@ -67,8 +78,3 @@ patchesJson6902:
       - op: replace
         path: /metadata/name
         value: {{ _template.cluster.name }}-worker-storage
-      - op: add
-        path: /spec/template/spec
-        value:
-          additionalDisksGiB:
-          - {{ _template.nodepool.additionaldisk }}