Merge branch '37987-speed-up-pipeline-creation' into 'master'

Speed Up Pipeline Creation

See merge request gitlab-org/gitlab-ce!17443

app/models/ci/pipeline.rb

@@ -14,7 +14,7 @@ module Ci
     has_many :stages
     has_many :statuses, class_name: 'CommitStatus', foreign_key: :commit_id, inverse_of: :pipeline
-    has_many :builds, foreign_key: :commit_id
+    has_many :builds, foreign_key: :commit_id, inverse_of: :pipeline
     has_many :trigger_requests, dependent: :destroy, foreign_key: :commit_id # rubocop:disable Cop/ActiveRecordDependent
     has_many :variables, class_name: 'Ci::PipelineVariable'

spec/services/ci/process_pipeline_service_spec.rb

@@ -9,6 +9,8 @@ describe Ci::ProcessPipelineService, '#execute' do
   end
   before do
+    stub_ci_pipeline_to_return_yaml_file
+
     stub_not_protect_default_branch
     project.add_developer(user)