Add note for enabling secrets on BYOVPC

Author: kbatuigas

local-antora-playbook.yml

@@ -17,7 +17,7 @@ content:
   - url: https://github.com/redpanda-data/docs
     branches: [v/*, api, shared, site-search,'!v-end-of-life/*']
   - url: https://github.com/redpanda-data/cloud-docs
-    branches: 'main'
+    branches: 'DOC-1222-Document-feature-Iceberg-on-Cloud-BYOVPC-GA-AWS-GCP'
   - url: https://github.com/redpanda-data/redpanda-labs
     branches: main
     start_paths: [docs,'*/docs']

modules/manage/partials/iceberg/use-iceberg-catalogs.adoc

@@ -11,6 +11,15 @@ After you have selected a catalog type at the cluster level and xref:{about-iceb
 
 Connect to an Iceberg REST catalog using the standard https://github.com/apache/iceberg/blob/main/open-api/rest-catalog-open-api.yaml[REST API^] supported by many catalog providers. Use this catalog integration type with REST-enabled Iceberg catalog services, such as https://docs.databricks.com/en/data-governance/unity-catalog/index.html[Databricks Unity^] and https://other-docs.snowflake.com/en/opencatalog/overview[Snowflake Open Catalog^].
 
+ifndef::env-cloud[]
+[NOTE]
+====
+For BYOVPC clusters, you must enable secrets management, which allows you to store and use secrets in your cluster's Iceberg catalog authentication properties. 
+
+Secrets management is enabled by default for AWS if you follow the guide to xref:get-started:cluster-types/byoc/aws/vpc-byo-aws.adoc[creating a new BYOVPC cluster]. For GCP, follow the guides to enable secrets management for a xref:get-started:cluster-types/byoc/gcp/vpc-byo-gcp.adoc[new BYOVPC cluster] or an xref:get-started:cluster-types/byoc/gcp/enable-secrets-byovpc-gcp.adoc[existing BYOVPC cluster].
+====
+endif::[]
+
 To connect to a REST catalog, set the following cluster configuration properties:
 
 * config_ref:iceberg_catalog_type,true,properties/cluster-properties[`iceberg_catalog_type`]: `rest`