Resolve "Dependency List is not up-to-date - backend"

ee/app/serializers/dependency_list_entity.rb

@@ -14,6 +14,10 @@ class DependencyListEntity < Grape::Entity
     expose :job_path, if: ->(_, options) { options[:build] && can_read_job_path? } do |_, options|
       project_build_path(project, options[:build].id)
     end
+
+    expose :generated_at, if: ->(_, options) { options[:build] && can_read_job_path? } do |_, options|
+      options[:build].finished_at
+    end
   end
 
   private

ee/changelogs/unreleased/14705-dl-not-update-backend.yml

+---
+title: Expose time when the build was generated
+merge_request: 17113
+author:
+type: added

ee/spec/fixtures/api/schemas/dependency_list.json

@@ -13,7 +13,8 @@
     },
     "report": {
       "status": { "type": "string" },
-      "job_path": { "type": "string" }
+      "job_path": { "type": "string" },
+      "generated_at": { "type": "string" }
     }
   },
   "additionalProperties": false

ee/spec/serializers/dependency_list_entity_spec.rb

@@ -33,6 +33,7 @@ describe DependencyListEntity do
           expect(subject[:dependencies][0][:name]).to eq('nokogiri')
           expect(subject[:report][:status]).to eq(:ok)
           expect(subject[:report][:job_path]).to eq(job_path)
+          expect(subject[:report][:generated_at]).to eq(ci_build.finished_at)
         end
       end
 
@@ -69,6 +70,7 @@ describe DependencyListEntity do
         it 'has only status failed_job' do
           expect(subject[:report][:status]).to eq(:job_failed)
           expect(subject[:report]).not_to include(:job_path)
+          expect(subject[:report]).not_to include(:generated_at)
         end
       end
     end
@@ -81,6 +83,7 @@ describe DependencyListEntity do
       it 'has status job_not_set_up and no job_path' do
         expect(subject[:report][:status]).to eq(:job_not_set_up)
         expect(subject[:report][:job_path]).not_to be_present
+        expect(subject[:report][:generated_at]).not_to be_present
       end
     end
   end