Add a new relation between a stage and related bridges

app/models/ci/stage.rb

@@ -14,6 +14,7 @@ module Ci
 
     has_many :statuses, class_name: 'CommitStatus', foreign_key: :stage_id
     has_many :builds, foreign_key: :stage_id
+    has_many :bridges, foreign_key: :stage_id
 
     with_options unless: :importing? do
       validates :project, presence: true

lib/gitlab/ci/pipeline/seed/stage.rb

@@ -41,7 +41,7 @@ module Gitlab
               ::Ci::Stage.new(attributes).tap do |stage|
                 seeds.each do |seed|
                   if seed.bridge?
-                    stage.statuses << seed.to_resource
+                    stage.bridges << seed.to_resource
                   else
                     stage.builds << seed.to_resource
                   end

spec/lib/gitlab/import_export/all_models.yml

@@ -138,6 +138,7 @@ stages:
 - pipeline
 - statuses
 - builds
+- bridges
 statuses:
 - project
 - pipeline