Memorize project to avoid re-query

[skip ci]

app/models/deploy_token.rb

@@ -4,6 +4,7 @@ class DeployToken < ActiveRecord::Base
   include Expirable
   include TokenAuthenticatable
   include PolicyActor
+  include Gitlab::Utils::StrongMemoize
   add_authentication_token_field :token
 
   AVAILABLE_SCOPES = %i(read_repository read_registry).freeze
@@ -49,8 +50,10 @@ class DeployToken < ActiveRecord::Base
   # to a single project, later we're going to extend
   # that to be for multiple projects and namespaces.
   def project
+    strong_memoize(:project) do
       projects.first
     end
+  end
 
   def expires_at
     expires_at = read_attribute(:expires_at)