Make it possible to access deployment details from pipeline

app/models/ci/pipeline.rb

@@ -31,6 +31,7 @@ module Ci
     has_many :auto_canceled_jobs, class_name: 'CommitStatus', foreign_key: 'auto_canceled_by_id'
 
     delegate :id, to: :project, prefix: true
+    delegate :deployment_variables, to: :project, prefix: true
 
     validates :source, exclusion: { in: %w(unknown), unless: :importing? }, on: :create
     validates :sha, presence: { unless: :importing? }

spec/models/ci/pipeline_spec.rb

@@ -27,6 +27,14 @@ describe Ci::Pipeline, :mailer do
   it { is_expected.to respond_to :git_author_email }
   it { is_expected.to respond_to :short_sha }
 
+  describe '#project_deployment_variables' do
+    it 'delegates deployment variables to project' do
+      expect(pipeline)
+        .to delegate_method(:deployment_variables)
+        .to(:project).with_prefix
+    end
+  end
+
   describe '#source' do
     context 'when creating new pipeline' do
       let(:pipeline) do