Add new field to Clusters table

Adds boolean field 'managed' to clusters table. This new column will be
used to distinguish those clusters that are automatically managed by
gitlab.

Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/56557

db/migrate/20190325165127_add_managed_to_cluster.rb

+# frozen_string_literal: true
+
+class AddManagedToCluster < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  DOWNTIME = false
+
+  def up
+    add_column_with_default(:clusters, :managed, :boolean, default: true)
+  end
+
+  def down
+    remove_column(:clusters, :managed)
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190322132835) do
+ActiveRecord::Schema.define(version: 20190325165127) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -670,6 +670,7 @@ ActiveRecord::Schema.define(version: 20190322132835) do
     t.string "environment_scope", default: "*", null: false
     t.integer "cluster_type", limit: 2, default: 3, null: false
     t.string "domain"
+    t.boolean "managed", default: true, null: false
     t.index ["enabled"], name: "index_clusters_on_enabled", using: :btree
     t.index ["user_id"], name: "index_clusters_on_user_id", using: :btree
   end

spec/factories/clusters/clusters.rb

@@ -3,6 +3,7 @@ FactoryBot.define do
     user
     name 'test-cluster'
     cluster_type :project_type
+    managed true
 
     trait :instance do
       cluster_type { Clusters::Cluster.cluster_types[:instance_type] }
@@ -63,5 +64,9 @@ FactoryBot.define do
     trait :with_domain do
       domain 'example.com'
     end
+
+    trait :user_managed do
+      managed false
+    end
   end
 end