DOC-1567 To configure Glue in cloud customers need to set iceberg_rest_catalog_credentials_source to config_file

Author: kbatuigas

modules/manage/pages/iceberg/iceberg-topics-aws-glue.adoc

@@ -100,6 +100,7 @@ endif::[]
 ifdef::env-cloud[]
 You must configure credentials for the AWS Glue Data Catalog integration using the following properties:
 
+* config_ref:iceberg_rest_catalog_credentials_source,true,properties/cluster-properties[`iceberg_rest_catalog_credentials_source`] set to `config_file`
 * config_ref:iceberg_rest_catalog_aws_access_key,true,properties/cluster-properties[`iceberg_rest_catalog_aws_access_key`]
 * config_ref:iceberg_rest_catalog_aws_secret_key,true,properties/cluster-properties[`iceberg_rest_catalog_aws_secret_key`], added as a secret value (see the <<update-cluster-configuration,next section>> for details)
 * config_ref:iceberg_rest_catalog_aws_region,true,properties/cluster-properties[`iceberg_rest_catalog_aws_region`]
@@ -155,6 +156,9 @@ rpk cluster config set \
   iceberg_rest_catalog_endpoint=https://glue.<glue-region>.amazonaws.com/iceberg \
   iceberg_rest_catalog_authentication_mode=aws_sigv4 \
   iceberg_rest_catalog_base_location=s3://<bucket-name>/<warehouse-path>
+  # Set credentials source to config_file if using 
+  # iceberg_rest_catalog_aws_access_key and iceberg_rest_catalog_aws_secret_key
+  iceberg_rest_catalog_credentials_source=config_file
   iceberg_rest_catalog_aws_region=<glue-region>
   iceberg_rest_catalog_aws_access_key=<glue-access-key>
   iceberg_rest_catalog_aws_secret_key=${secrets.<glue-secret-key-name>}

modules/reference/pages/properties/cluster-properties.adoc

@@ -2260,7 +2260,13 @@ AWS access key for Iceberg REST catalog SigV4 authentication. If not set, falls
 
 === iceberg_rest_catalog_credentials_source
 
+ifndef::env-cloud[]
 Source of AWS credentials for Iceberg REST catalog SigV4 authentication. If not set, falls back to xref:reference:properties/object-storage-properties.adoc#cloud_storage_credentials_source[`cloud_storage_credentials_source`] when using aws_sigv4 authentication mode.
+endif::[]
+
+ifdef::env-cloud[]
+Source of AWS credentials for Iceberg REST catalog SigV4 authentication. If using `iceberg_rest_catalog_aws_access_key` and `iceberg_rest_catalog_aws_secret_key` for Glue catalog authentication, you must set this property to `config_file`.
+endif::[]
 
 *Accepted values*: `aws_instance_metadata`, `azure_aks_oidc_federation`, `azure_vm_instance_metadata`, `config_file`, `gcp_instance_metadata`, `sts`.