Update version column after application is updated

Note: updating version column after :updating is not ideal in the
updating -> update_erroed case. This will mean that the application now
records the version as the version that failed to upgrade, not the
version that it is currently on.

app/models/clusters/concerns/application_version.rb

@@ -10,6 +10,10 @@ module Clusters
           after_transition any => [:installing] do |application|
             application.update(version: application.class.const_get(:VERSION))
           end
+
+          before_transition any => :updated do |application|
+            application.version = application.class.const_get(:VERSION)
+          end
         end
       end
     end

spec/support/shared_examples/models/cluster_application_status_shared_examples.rb

@@ -78,6 +78,16 @@ shared_examples 'cluster application status specs' do |application_name|
 
         expect(subject.cluster.application_helm.version).to eq(Gitlab::Kubernetes::Helm::HELM_VERSION)
       end
+
+      it 'updates the version for the application' do
+        subject.update!(version: '0.0.0')
+
+        subject.make_updated!
+
+        subject.reload
+
+        expect(subject.version).to eq(subject.class.const_get(:VERSION))
+      end
     end
 
     describe '#make_errored' do