add immutability check for nodegroup fields (#152)

Description of changes:

- Uses runtime/code-gen `v0.44.0`
- Enhances nodegroup field validation by marking immutable fields:
   - AmiType
   - InstanceTypes
   - ClusterName
   - Name
   
Prevents modifications that EKS does not allow to be changed after creation.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: rushmash91

Diff for: apis/v1alpha1/generator.yaml

@@ -312,6 +312,9 @@ resources:
         references:
           resource: Cluster
           path: Spec.Name
+        is_immutable: true
+      Name:
+        is_immutable: true
       NodeRole:
         references:
           service_name: iam
@@ -333,6 +336,10 @@ resources:
           resource: Subnet
           path: Status.SubnetID
         is_immutable: true
+      AmiType:
+        is_immutable: true
+      InstanceTypes:
+        is_immutable: true
       Taints:
         compare:
           is_ignored: true

Diff for: apis/v1alpha1/nodegroup.go

@@ -85,6 +85,9 @@ spec:
                   Amazon EKS, see Customizing managed nodes with launch templates (https://docs.aws.amazon.com/eks/latest/userguide/launch-templates.html)
                   in the Amazon EKS User Guide.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               capacityType:
                 description: The capacity type for your node group.
                 type: string
@@ -96,6 +99,9 @@ spec:
               clusterName:
                 description: The name of your cluster.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               clusterRef:
                 description: "AWSResourceReferenceWrapper provides a wrapper around
                   *AWSResourceReference\ntype to provide more user friendly syntax
@@ -144,6 +150,9 @@ spec:
                 items:
                   type: string
                 type: array
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               labels:
                 additionalProperties:
                   type: string
@@ -169,6 +178,9 @@ spec:
               name:
                 description: The unique name to give your node group.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               nodeRole:
                 description: |-
                   The Amazon Resource Name (ARN) of the IAM role to associate with your node

Diff for: config/crd/bases/eks.services.k8s.aws_nodegroups.yaml

@@ -312,6 +312,9 @@ resources:
         references:
           resource: Cluster
           path: Spec.Name
+        is_immutable: true
+      Name:
+        is_immutable: true
       NodeRole:
         references:
           service_name: iam
@@ -333,6 +336,10 @@ resources:
           resource: Subnet
           path: Status.SubnetID
         is_immutable: true
+      AmiType:
+        is_immutable: true
+      InstanceTypes:
+        is_immutable: true
       Taints:
         compare:
           is_ignored: true

Diff for: generator.yaml

@@ -85,6 +85,9 @@ spec:
                   Amazon EKS, see Customizing managed nodes with launch templates (https://docs.aws.amazon.com/eks/latest/userguide/launch-templates.html)
                   in the Amazon EKS User Guide.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               capacityType:
                 description: The capacity type for your node group.
                 type: string
@@ -96,6 +99,9 @@ spec:
               clusterName:
                 description: The name of your cluster.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               clusterRef:
                 description: "AWSResourceReferenceWrapper provides a wrapper around
                   *AWSResourceReference\ntype to provide more user friendly syntax
@@ -144,6 +150,9 @@ spec:
                 items:
                   type: string
                 type: array
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               labels:
                 additionalProperties:
                   type: string
@@ -169,6 +178,9 @@ spec:
               name:
                 description: The unique name to give your node group.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               nodeRole:
                 description: |-
                   The Amazon Resource Name (ARN) of the IAM role to associate with your node