Expose sync_object_storage in the Geo Node API

ee/app/models/geo_node.rb

@@ -22,6 +22,7 @@ class GeoNode < ApplicationRecord
 
   validates :primary, uniqueness: { message: 'node already exists' }, if: :primary
   validates :enabled, if: :primary, acceptance: { message: 'Geo primary node cannot be disabled' }
+  validates :sync_object_storage, if: :primary, inclusion: { in: [false], message: 'Geo primary node doesnt use sync_object_storage value' }
 
   validates :access_key, presence: true
   validates :encrypted_secret_access_key, presence: true

ee/lib/api/geo_nodes.rb

@@ -147,6 +147,7 @@ module API
           optional :repos_max_capacity, type: Integer, desc: 'Control the maximum concurrency of repository backfill for this secondary node'
           optional :verification_max_capacity, type: Integer, desc: 'Control the maximum concurrency of repository verification for this node'
           optional :container_repositories_max_capacity, type: Integer, desc: 'Control the maximum concurrency of container repository sync for this node'
+          optional :sync_object_storage, type: Boolean, desc: 'Flag indicating if the secondary Geo node will handle replication for blobs on the Object Storage'
         end
         put do
           not_found!('GeoNode') unless geo_node

ee/lib/ee/api/entities.rb

@@ -485,6 +485,7 @@ module EE
         expose :repos_max_capacity
         expose :verification_max_capacity
         expose :container_repositories_max_capacity
+        expose :sync_object_storage, if: ->(geo_node, _) { geo_node.secondary? }
 
         # Retained for backwards compatibility. Remove in API v5
         expose :clone_protocol do |_record, _options|

ee/spec/models/geo_node_spec.rb

@@ -43,6 +43,13 @@ describe GeoNode, :geo, type: :model do
         expect(primary_node).not_to be_valid
         expect(primary_node.errors).to include(:enabled)
       end
+
+      it 'requires sync_object_storage to be disabled' do
+        primary_node.sync_object_storage = true
+
+        expect(primary_node).not_to be_valid
+        expect(primary_node.errors).to include(:sync_object_storage)
+      end
     end
 
     context 'when validating url' do
@@ -118,6 +125,7 @@ describe GeoNode, :geo, type: :model do
       :repos_max_capacity                  | 25
       :files_max_capacity                  | 10
       :container_repositories_max_capacity | 10
+      :sync_object_storage                 | false
     end
 
     with_them do