Install docker in Vagrant environment

This allows for working with the Docker-based BATS tests

Signed-off-by: James Casey <james@chef.io>

Vagrantfile

@@ -15,5 +15,6 @@ Vagrant.configure("2") do |config|
 
   config.vm.provision "file", source: "components/hab/install.sh", destination: "/tmp/install.sh"
   config.vm.provision "shell", path: "support/linux/install_dev_0_ubuntu_latest.sh"
+  config.vm.provision "shell", path: "support/linux/install_dev_8_docker.sh"
   config.vm.provision "shell", path: "support/linux/install_dev_9_linux.sh"
 end

support/linux/install_dev_8_docker.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -eux
+
+# Install Docker to run bats tests
+# From: https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-using-the-repository
+#
+sudo apt-get install -y --no-install-recommends \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    software-properties-common
+
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+sudo add-apt-repository \
+  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+  $(lsb_release -cs) \
+  stable"
+
+sudo -E apt-get install -y --no-install-recommends \
+  docker-ce
+
+# if running on a Vagrantbox, add the vagrant user
+# as well as the current user
+if getent passwd vagrant > /dev/null 2>&1; then
+  sudo -E usermod -aG docker vagrant
+fi
+sudo -E usermod -aG docker ${USER}