Updated docker-install for bionic (when docker releases it)

docker-install.sh

#!/bin/bash
set -ex

## Install Docker on Ubuntu 16.04 (and probably future versions)
## curl -sSL 'https://gist.githubusercontent.com/koshatul/fa7d71fc38037dbd3094be400f77bf74/raw/docker-install.sh' | /bin/bash /dev/stdin --

sudo apt-get install -qy --no-install-recommends \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

case $(lsb_release -cs) in 
    xenial)
        sudo apt-get install -qy --no-install-recommends \
            linux-image-extra-$(uname -r) \
            linux-image-extra-virtual
        ;;
    bionic)
        sudo apt-get install -qy --no-install-recommends \
            gpg-agent
        ;;

esac

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

apt-key fingerprint 0EBFCD88

sudo add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

sudo apt-get update
sudo apt-get -y install docker-ce