Move app configurations to the end of Dockerfile
Move app configurations to the end of Dockerfile

GoogleCloudPlatform/ruby-docker,GoogleCloudPlatform/ruby-docker,dazuma/ruby-docker,dazuma/ruby-docker,dazuma/ruby-docker,remi/ruby-docker,GoogleCloudPlatform/ruby-docker,dazuma/ruby-docker,GoogleCloudPlatform/ruby-docker