fix allowed keys validator to use correct attribute as error base?

lib/gitlab/ci/config/entry/validators.rb

@@ -10,8 +10,8 @@ module Gitlab
               unknown_keys = value.try(:keys).to_a - options[:in]
 
               if unknown_keys.any?
-                record.errors.add(:config, "#{attribute} contains unknown keys: " +
-                                            unknown_keys.join(', '))
+                record.errors.add(attribute, "contains unknown keys: " +
+                                             unknown_keys.join(', '))
               end
             end
           end

spec/lib/gitlab/ci/config/entry/job_spec.rb

@@ -187,7 +187,7 @@ describe Gitlab::Ci::Config::Entry::Job do
             it 'returns error about the unknown key' do
               expect(entry).not_to be_valid
               expect(entry.errors)
-                .to include 'job config retry contains unknown keys: unknown_key, one_more'
+                .to include 'job retry contains unknown keys: unknown_key, one_more'
             end
           end