mark subscription endpoint is immutable (#98)

fixes aws-controllers-k8s/community#2620

Description of changes:
- marks Subscription Endpoint as immutable

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

Author: rushmash91

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2025-09-19T17:32:21Z"
-  build_hash: 6b4211163dcc34776b01da9a18217bac0f4103fd
-  go_version: go1.24.6
-  version: v0.52.0
-api_directory_checksum: 4c3a3e96fdcd7220a53c81643e6ffe572b04916b
+  build_date: "2025-09-26T23:02:03Z"
+  build_hash: 0f331c7241c222f9760085d2d792e2ce370fe89f
+  go_version: go1.25.0
+  version: v0.52.0-3-g0f331c7
+api_directory_checksum: f1735657725b97003faf27c1e05eff54b153862f
 api_version: v1alpha1
 aws_sdk_go_version: v1.32.6
 generator_config_info:
-  file_checksum: 1a36dd6f898f119460956441fc7f99300b59218e
+  file_checksum: e041d21cb079729530338714e8c028948c62695d
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/generator.yaml

@@ -231,6 +231,8 @@ resources:
       EffectiveDeliveryPolicy:
         is_attribute: true
         is_read_only: true
+      Endpoint:
+       is_immutable: true
       FilterPolicy:
         is_attribute: true
       FilterPolicyScope:

apis/v1alpha1/subscription.go

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: platformapplications.sns.services.k8s.aws
 spec:
   group: sns.services.k8s.aws

config/crd/bases/sns.services.k8s.aws_platformapplications.yaml

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: platformendpoints.sns.services.k8s.aws
 spec:
   group: sns.services.k8s.aws

config/crd/bases/sns.services.k8s.aws_platformendpoints.yaml

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: subscriptions.sns.services.k8s.aws
 spec:
   group: sns.services.k8s.aws
@@ -82,6 +82,9 @@ spec:
                      * For the firehose protocol, the endpoint is the ARN of an Amazon Kinesis
                      Data Firehose delivery stream.
                 type: string
+                x-kubernetes-validations:
+                - message: Value is immutable once set
+                  rule: self == oldSelf
               filterPolicy:
                 type: string
               filterPolicyScope:

config/crd/bases/sns.services.k8s.aws_subscriptions.yaml

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: topics.sns.services.k8s.aws
 spec:
   group: sns.services.k8s.aws

config/crd/bases/sns.services.k8s.aws_topics.yaml

@@ -231,6 +231,8 @@ resources:
       EffectiveDeliveryPolicy:
         is_attribute: true
         is_read_only: true
+      Endpoint:
+       is_immutable: true
       FilterPolicy:
         is_attribute: true
       FilterPolicyScope:

generator.yaml

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: adoptedresources.services.k8s.aws
 spec:
   group: services.k8s.aws

helm/crds/services.k8s.aws_adoptedresources.yaml

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.16.2
+    controller-gen.kubebuilder.io/version: v0.19.0
   name: fieldexports.services.k8s.aws
 spec:
   group: services.k8s.aws