Bootstrap Packer template for libvirt and Vbox

Signed-off-by: Gianluca Arbezzano <gianarb92@gmail.com>

deploy/vagrant/basebox/.gitignore

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+output*

deploy/vagrant/basebox/README.md

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+This directory contains a provisioning mechanism for the Vagrant boxes we ship
+as part of Sandbox.
+
+In order to self contain and distribute the required dependencies for Tinkerbell
+and Sandbox without having to download all of them runtime we decided to use
+[Packer.io](https://packer.io) to build boxes that you can use when provisioning
+Tinkerbell on Vagrant.
+
+Currently the generated boxes are available via [Vagrant
+Cloud](https://app.vagrantup.com/tinkerbelloss).
+
+---
+
+## Build
+
+To build the boxes checkout the right directory and run
+
+```terminal
+$ packer build --parallel-builds=1 ./template.json
+```
+
+`-parallel-builds=1` is required because the template builds images for multiple
+providers using the [Vagrant
+builder](https://www.packer.io/docs/builders/vagrant) and I didn't manage to get
+it to work in parallel yet.
+
+## Deploy to Vagrant Cloud
+
+I didn't find a way to make the Vagrant Cloud post processor to work. But I use
+the vagrant cli `vagrant cloud publish` command.

deploy/vagrant/basebox/ubuntu1804/provision.sh

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+#!/bin/bash
+# abort this script on errors
+set -euxo pipefail
+
+setup_docker() (
+	# steps from https://docs.docker.com/engine/install/ubuntu/
+	sudo apt-get install -y \
+		apt-transport-https \
+		ca-certificates \
+		curl \
+		gnupg-agent \
+		software-properties-common
+
+	curl -fsSL https://download.docker.com/linux/ubuntu/gpg |
+		sudo apt-key add -
+
+	local repo
+	repo=$(
+		printf "deb [arch=amd64] https://download.docker.com/linux/ubuntu %s stable" \
+			"$(lsb_release -cs)"
+	)
+	sudo add-apt-repository "$repo"
+
+	sudo apt-get update
+	sudo apt-get install -y docker-ce docker-ce-cli containerd.io
+)
+
+setup_docker_compose() (
+	# from https://docs.docker.com/compose/install/
+	sudo curl -L \
+		"https://github.com/docker/compose/releases/download/1.26.0/docker-compose-$(uname -s)-$(uname -m)" \
+		-o /usr/local/bin/docker-compose
+
+	sudo chmod +x /usr/local/bin/docker-compose
+)
+
+main() (
+	export DEBIAN_FRONTEND=noninteractive
+
+	sudo apt-get update
+	setup_docker
+	setup_docker_compose
+	sudo apt-get install -y jq
+	sudo usermod -aG docker vagrant
+)
+
+main

deploy/vagrant/basebox/ubuntu1804/template.json

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+{
+  "builders": [
+    {
+      "communicator": "ssh",
+      "name": "vagrant-virtualbox",
+      "provider": "virtualbox",
+      "source_path": "generic/ubuntu1804",
+      "type": "vagrant"
+    },
+    {
+      "communicator": "ssh",
+      "name": "vagrant-libvirt",
+      "provider": "libvirt",
+      "source_path": "generic/ubuntu1804",
+      "type": "vagrant"
+    }
+  ],
+  "provisioners": [
+    {
+      "script": "provision.sh",
+      "type": "shell"
+    }
+  ],
+  "variables": {
+    "cloud_token": "{{ env `VAGRANT_CLOUD_TOKEN` }}"
+  }
+}