Fix rubocop offense and use attr_accessor

app/services/keys/create_service.rb

@@ -2,6 +2,8 @@
 
 module Keys
   class CreateService < ::Keys::BaseService
+    attr_accessor :current_user
+
     def initialize(current_user, params = {})
       @current_user, @params = current_user, params
       @ip_address = @params.delete(:ip_address)

ee/app/services/ee/keys/create_service.rb

@@ -14,7 +14,7 @@ module EE
       end
 
       def audit_event_service
-        ::AuditEventService.new(@current_user,
+        ::AuditEventService.new(current_user,
                                 user,
                                 action: :custom,
                                 custom_message: 'Added SSH key',

ee/spec/services/keys/create_service_spec.rb

@@ -3,18 +3,20 @@
 require 'spec_helper'
 
 RSpec.describe Keys::CreateService do
-  let(:admin_user) { create(:admin)}
+  let(:admin) { create(:admin) }
   let(:user) { create(:user) }
   let(:params) { attributes_for(:key).merge(user: user) }
 
-  subject { described_class.new(admin_user, params) }
+  subject { described_class.new(admin, params) }
 
   it 'creates' do
     stub_licensed_features(extended_audit_events: true)
 
     expect { subject.execute }.to change { SecurityEvent.count }.by(1)
+
     event = SecurityEvent.last
-    expect(event.author_name).to eq(admin_user.name)
+
+    expect(event.author_name).to eq(admin.name)
     expect(event.entity_id).to eq(user.id)
   end
 end