Add documentation for storage and persistence for Kubernetes

Author: simonrw

src/content/docs/aws/enterprise/kubernetes/concepts.md

@@ -91,6 +91,9 @@ In a Kubernetes deployment:
 
 This enables applications running in Kubernetes to interact with LocalStack using standard AWS SDK endpoint resolution without additional configuration.
 
+## Storage
+
+LocalStack can store data that persists across sessions. See the [LocalStack volume](/aws/capabilities/config/filesystem/#localstack-volume) page for more information. This volume directory can be created in Kubernetes using a [Persistent Volume](https://kubernetes.io/docs/concepts/storage/persistent-volumes/) and associated [Persistent Volume Claim](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims). This volume should be mounted into the pod at `/var/lib/localstack` to persist LocalStack state. See the [Operator](/aws/enterprise/kubernetes/kubernetes-operator/) and [Helm Chart](/aws/enterprise/kubernetes/deploy-helm-chart) documentation for specific details.
 
 ## Choose execution mode
 

src/content/docs/aws/enterprise/kubernetes/deploy-helm-chart.md

@@ -157,6 +157,10 @@ persistence:
 This is especially useful for workflows where you seed resources or rely on state across restarts.
 :::
 
+This performs these two changes:
+* sets `PERSISTENCE=1`, and
+* creates a psrsistent volume claim for the (customizable) storage class.
+
 
 ### Set Pod resource requests and limits
 

src/content/docs/aws/enterprise/kubernetes/kubernetes-operator.md

@@ -223,6 +223,35 @@ curl http://1d4b6907.execute-api.localstack-localstack.my-namespace:4566/json
 
 This works without additional DNS configuration in client applications.
 
+## Storage
+
+:::note
+Requires Operator version 0.4.0 or later.
+:::
+
+To persist the [LocalStack volume](/aws/capabilities/config/filesystem/#localstack-volume), use the `spec.pvcName` to specify the PVC you want to mount. This automatically mounts the PVC at `/var/lib/localstack`.
+
+For example:
+
+```yaml
+# pvc definition
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: myPvc
+spec:
+  # ...
+
+# LocalStack instance definition
+apiVersion: api.localstack.cloud/v1alpha1
+kind: LocalStack
+metadata:
+  name: localstack
+  namespace: my-namespace
+spec:
+  # ...
+  pvcName: myPvc
+```
 
 ## Update
 
@@ -261,4 +290,4 @@ Ensure that:
 * Each LocalStack instance requires its **own auth token**
 * The Operator supports **LocalStack Pro images only**
 * DNS integration and Cloud Pod automation are Operator-exclusive features
-:::
+:::