Fix spec failures

app/models/ci/build.rb

@@ -340,7 +340,7 @@ module Ci
     end
     def runner_required_features
-      %w(variables)
+      []
     end
     def merge_request
@@ -598,7 +598,7 @@ module Ci
     def supported_runner?(features)
       runner_required_features.all? do |feature_name|
-        features[feature_name]
+        features&.dig(feature_name)
       end
     end

app/models/commit_status.rb

@@ -47,7 +47,7 @@ class CommitStatus < ActiveRecord::Base
     stuck_or_timeout_failure: 3,
     runner_system_failure: 4,
     missing_dependency_failure: 5,
-    runner_unsupported: 6,
+    runner_unsupported: 6
   }
   ##

app/services/ci/register_job_service.rb

@@ -81,7 +81,7 @@ module Ci
       end
       build.run!
-      return true
+      true
     end
     def builds_for_shared_runner