fix: set 'PLACEHOLDER' as default for instance type

Author: supershal

charts/cluster-api-runtime-extensions-nutanix/defaultclusterclasses/aws-cluster-class.yaml

@@ -106,7 +106,7 @@ spec:
   template:
     spec:
       iamInstanceProfile: control-plane.cluster-api-provider-aws.sigs.k8s.io
-      instanceType: m5.xlarge
+      instanceType: PLACEHOLDER
       sshKeyName: ""
 ---
 apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
@@ -119,7 +119,7 @@ spec:
   template:
     spec:
       iamInstanceProfile: nodes.cluster-api-provider-aws.sigs.k8s.io
-      instanceType: m5.2xlarge
+      instanceType: PLACEHOLDER
       sshKeyName: ""
 ---
 apiVersion: bootstrap.cluster.x-k8s.io/v1beta1

hack/examples/overlays/clusterclasses/aws/kustomization.yaml.tmpl

@@ -51,11 +51,11 @@ patches:
     patch: |-
       - op: "add"
         path: "/spec/template/spec/instanceType"
-        value: "m5.2xlarge"
+        value: "PLACEHOLDER"
   - target:
       kind: AWSMachineTemplate
       name: quick-start-control-plane
     patch: |-
       - op: "add"
         path: "/spec/template/spec/instanceType"
-        value: "m5.xlarge"
+        value: "PLACEHOLDER"