Create metadata object on build object creation

app/models/ci/build.rb

@@ -90,6 +90,7 @@ module Ci
     before_save :ensure_token
     before_destroy { unscoped_project }
 
+    before_create :ensure_metadata
     after_create unless: :importing? do |build|
       run_after_commit { BuildHooksWorker.perform_async(build.id) }
     end

spec/factories/ci/build_metadata.rb

-FactoryBot.define do
-  factory :ci_build_metadata, class: Ci::BuildMetadata do
-    build factory: :ci_build
-
-    after(:build) do |build_metadata, _|
-      build_metadata.project ||= build_metadata.build.project
-    end
-  end
-end

spec/models/ci/build_metadata_spec.rb

@@ -13,7 +13,7 @@ describe Ci::BuildMetadata do
   end
 
   let(:build) { create(:ci_build, pipeline: pipeline) }
-  let(:build_metadata) { create(:ci_build_metadata, build: build) }
+  let(:build_metadata) { build.metadata }
 
   describe '#update_timeout_state' do
     subject { build_metadata }