provider/aws: Add replica_source_db to the aws_db_instance datasource (#13842)

Fixes: #13471

builtin/providers/aws/data_source_aws_db_instance.go

@@ -188,6 +188,11 @@ func dataSourceAwsDbInstance() *schema.Resource {
 				Computed: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
 			},
+
+			"replicate_source_db": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
 		},
 	}
 }
@@ -271,6 +276,7 @@ func dataSourceAwsDbInstanceRead(d *schema.ResourceData, meta interface{}) error
 	d.Set("storage_encrypted", dbInstance.StorageEncrypted)
 	d.Set("storage_type", dbInstance.StorageType)
 	d.Set("timezone", dbInstance.Timezone)
+	d.Set("replicate_source_db", dbInstance.ReadReplicaSourceDBInstanceIdentifier)
 
 	var vpcSecurityGroups []string
 	for _, v := range dbInstance.VpcSecurityGroups {

website/source/docs/providers/aws/d/db_instance.html.markdown

@@ -61,3 +61,4 @@ The following attributes are exported:
 * `storage_type` - Specifies the storage type associated with DB instance.
 * `timezone` - The time zone of the DB instance.
 * `vpc_security_groups` - Provides a list of VPC security group elements that the DB instance belongs to.
+* `replicate_source_db` - The identifier of the source DB that this is a replica of.