Add BigLake doc to Cloud

modules/ROOT/nav.adoc

@@ -435,6 +435,7 @@
 *** xref:manage:iceberg/rest-catalog/index.adoc[]
 **** xref:manage:iceberg/iceberg-topics-aws-glue.adoc[AWS Glue]
 **** xref:manage:iceberg/iceberg-topics-databricks-unity.adoc[Databricks Unity Catalog]
+**** xref:manage:iceberg/iceberg-topics-gcp-biglake.adoc[GCP Lakehouse]
 **** xref:manage:iceberg/redpanda-topics-iceberg-snowflake-catalog.adoc[Snowflake and Open Catalog]
 *** xref:manage:iceberg/query-iceberg-topics.adoc[]
 *** xref:manage:iceberg/migrate-iceberg-catalog.adoc[]

modules/get-started/pages/whats-new-cloud.adoc

@@ -8,6 +8,10 @@ This page lists new features added to Redpanda Cloud.
 
 == June 2026
 
+=== GCP Lakehouse catalog for Iceberg topics
+
+BYOC clusters on GCP can now use GCP Lakehouse as an Iceberg REST catalog. See xref:manage:iceberg/iceberg-topics-gcp-biglake.adoc[].
+
 === Connect to Amazon Aurora with IAM roles
 
 A new guide walks Cloud customers through configuring IAM Roles for Service Accounts (IRSA) so Redpanda Connect pipelines can authenticate to Amazon Aurora without storing static database credentials. The setup uses a two-hop role chain: the Connect pipeline role assumes a customer-owned database connect role in the Aurora account, which generates a short-lived RDS IAM authentication token. Applies to `postgres_cdc`, `pg_stream`, and `mysql_cdc` inputs. See xref:develop:connect/guides/cloud/aws-iam-aurora.adoc[Authenticate to Amazon Aurora using IAM roles].

modules/manage/pages/iceberg/iceberg-topics-gcp-biglake.adoc

@@ -0,0 +1,5 @@
+= Use Iceberg Topics with GCP Lakehouse
+:description: Add Redpanda topics as Iceberg tables to Google Lakehouse for Apache Iceberg that you can query from Google BigQuery.
+:page-categories: Iceberg, Tiered Storage, Management, High Availability, Data Replication, Integration
+
+include::streaming:manage:iceberg/iceberg-topics-gcp-biglake.adoc[tag=single-source]