Add basic implementation of CI/CD bridge job

app/models/ci/bridge.rb

+# frozen_string_literal: true
+
+module Ci
+  class Bridge < CommitStatus
+    include Importable
+    include AfterCommitQueue
+    include TokenAuthenticatable
+    include Gitlab::Utils::StrongMemoize
+
+    belongs_to :project, inverse_of: :builds
+
+    serialize :options # rubocop:disable Cop/ActiveRecordSerialize
+    validates :ref, presence: true
+
+    before_save :ensure_token
+
+    add_authentication_token_field :token, encrypted: true
+
+    def self.retry(bridge, current_user)
+      raise NotImplementedError
+    end
+
+    def tags
+      [:bridge]
+    end
+
+    def detailed_status(current_user)
+      Gitlab::Ci::Status::Bridge::Factory
+        .new(self, current_user)
+        .fabricate!
+    end
+
+    def predefined_variables
+      raise NotImplementedError
+    end
+
+    def execute_hooks
+      raise NotImplementedError
+    end
+  end
+end

lib/gitlab/ci/status/bridge/common.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Status
+      module Bridge
+        module Common
+          def label
+            subject.description
+          end
+
+          def has_details?
+            false
+          end
+
+          def has_action?
+            false
+          end
+
+          def details_path
+            raise NotImplementedError
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/status/bridge/factory.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Status
+      module Bridge
+        class Factory < Status::Factory
+          def self.common_helpers
+            Status::Bridge::Common
+          end
+        end
+      end
+    end
+  end
+end

spec/factories/ci/bridge.rb

+FactoryBot.define do
+  factory :ci_bridge, class: Ci::Bridge do
+    name ' bridge'
+    stage 'test'
+    stage_idx 0
+    ref 'master'
+    tag false
+    created_at 'Di 29. Okt 09:50:00 CET 2013'
+    status :success
+
+    pipeline factory: :ci_pipeline
+
+    after(:build) do |bridge, evaluator|
+      bridge.project ||= bridge.pipeline.project
+    end
+  end
+end

spec/models/ci/bridge_spec.rb

+require 'spec_helper'
+
+describe Ci::Bridge do
+  set(:project) { create(:project) }
+  set(:pipeline) { create(:ci_pipeline, project: project) }
+
+  let(:bridge) do
+    create(:ci_bridge, pipeline: pipeline)
+  end
+
+  describe '#tags' do
+    it 'only has a bridge tag' do
+      expect(bridge.tags).to eq [:bridge]
+    end
+  end
+
+  describe '#detailed_status' do
+    let(:user) { create(:user) }
+    let(:status) { bridge.detailed_status(user) }
+
+    it 'returns detailed status object' do
+      expect(status).to be_a Gitlab::Ci::Status::Success
+    end
+  end
+end