Add build finished worker that creates a workflow

app/models/ci/build.rb

@@ -83,8 +83,7 @@ module Ci
       after_transition any => [:success, :failed, :canceled] do |build|
         build.run_after_commit do
-          BuildCoverageWorker.perform_async(id)
-          BuildHooksWorker.perform_async(id)
+          BuildFinishedWorker.perform_async(id)
         end
       end

app/workers/build_finished_worker.rb

+class BuildFinishedWorker
+  include Sidekiq::Worker
+
+  def perform(build_id)
+    Ci::Build.find_by(id: build_id).try do |build|
+      build.with_lock do
+        BuildCoverageWorker.new.perform(build.id)
+        BuildHooksWorker.new.perform(build.id)
+      end
+    end
+  end
+end

spec/workers/build_finished_worker_spec.rb

+require 'spec_helper'
+
+describe BuildFinishedWorker do
+  describe '#perform' do
+    context 'when build exists' do
+      let(:build) { create(:ci_build) }
+
+      it 'calculates coverage and calls hooks' do
+        expect(BuildCoverageWorker)
+          .to receive(:new).ordered.and_call_original
+        expect(BuildHooksWorker)
+          .to receive(:new).ordered.and_call_original
+
+        expect_any_instance_of(BuildCoverageWorker)
+          .to receive(:perform)
+        expect_any_instance_of(BuildHooksWorker)
+          .to receive(:perform)
+
+        described_class.new.perform(build.id)
+      end
+    end
+
+    context 'when build does not exist' do
+      it 'does not raise exception' do
+        expect { described_class.new.perform(123) }
+          .not_to raise_error
+      end
+    end
+  end
+end