Do not inherit build policy in pipeline policy

app/policies/base_policy.rb

@@ -97,6 +97,10 @@ class BasePolicy
     rules
   end
+  def rules
+    raise NotImplementedError
+  end
+
   def delegate!(new_subject)
     @rule_set.merge(Ability.allowed(@user, new_subject))
   end

app/policies/ci/pipeline_policy.rb

 module Ci
-  class PipelinePolicy < BuildPolicy
+  class PipelinePolicy < BasePolicy
+    def rules
+      delegate! @subject.project
+    end
   end
 end