Add apt-utils to the base image so installs don't emit warnings
Add apt-utils to the base image so installs don't emit warnings

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