Accept nested Variables in Ci::Pipeline

app/models/ci/pipeline.rb

@@ -32,6 +32,8 @@ module Ci
     has_many :auto_canceled_pipelines, class_name: 'Ci::Pipeline', foreign_key: 'auto_canceled_by_id'
     has_many :auto_canceled_jobs, class_name: 'CommitStatus', foreign_key: 'auto_canceled_by_id'
 
+    accepts_nested_attributes_for :variables, reject_if: :persisted?
+
     delegate :id, to: :project, prefix: true
     delegate :full_path, to: :project, prefix: true