Add vagrant file

* This allows development on non-Linux environments.
* This allows you to put heckler on it's own VLAN.
* VMs can be convenient.

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+LIBVIRT_HOST_IP = ENV["LIBVIRT_HOST_IP"] || "192.168.56.1"
+HECKLER_IP = ENV["HECKLER_IP"] || "192.168.56.4"
+BRIDGE_IF = ENV["BRIDGE_IF"] || false
+
+Vagrant.configure("2") do |config|
+  config.vm.provider :libvirt do |libvirt|
+    libvirt.qemu_use_session = false
+  end
+
+  config.vm.define "heckler" do |heckler|
+    heckler.vm.box = "generic/ubuntu2004"
+    heckler.vm.synced_folder "./", "/heckler/"
+
+    if BRIDGE_IF
+      heckler.vm.network "public_network", ip: HECKLER_IP,
+                                               bridge: BRIDGE_IF,
+                                               libvirt__network_name: "heckler_network",
+                                               libvirt__host_ip: LIBVIRT_HOST_IP,
+                                               libvirt__netmask: "255.255.255.0",
+                                               libvirt__dhcp_enabled: false,
+                                               auto_config: false
+    else
+      heckler.vm.network "private_network", ip: HECKLER_IP,
+                                                libvirt__network_name: "heckler_network",
+                                                libvirt__host_ip: LIBVIRT_HOST_IP,
+                                                libvirt__netmask: "255.255.255.0",
+                                                libvirt__dhcp_enabled: false,
+                                                auto_config: false
+    end
+
+    heckler.vm.provider "virtualbox" do |v, override|
+      v.memory = 2048
+      v.cpus = 2
+      override.vm.synced_folder "./", "/heckler/"
+    end
+
+    heckler.vm.provider "libvirt" do |l, override|
+      l.memory = 2048
+      l.cpus = 2
+      override.vm.synced_folder "./", "/heckler/"
+    end
+
+    heckler.vm.provision :shell, path: "setup.sh", args: [HECKLER_IP]
+  end
+end

setup.sh

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+#!/usr/bin/env bash
+
+install_docker() {
+	curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+	add-apt-repository "deb https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+	update_apt
+	apt-get install --no-install-recommends containerd.io docker-ce docker-ce-cli
+	gpasswd -a vagrant docker
+}
+
+install_docker_compose() {
+	apt-get install --no-install-recommends python3-pip
+	pip install docker-compose
+}
+
+apt-get() {
+	DEBIAN_FRONTEND=noninteractive command apt-get \
+		--allow-change-held-packages \
+		--allow-downgrades \
+		--allow-remove-essential \
+		--allow-unauthenticated \
+		--option Dpkg::Options::=--force-confdef \
+		--option Dpkg::Options::=--force-confold \
+		--yes \
+		"$@"
+}
+
+update_apt() {
+	apt-get update
+}
+
+setup_layer2_network() {
+	local host_ip=$1
+	ip addr show dev eth1 | grep -q "$host_ip" && return 0
+	ip addr add "$host_ip/24" dev eth1
+	ip link set dev eth1 up
+}
+
+tweak_bash_interactive_settings() {
+	readarray -t aliases <<-EOF
+		dc=docker-compose
+	EOF
+	for alias in "${aliases[@]}"; do
+		grep -q "$alias" ~vagrant/.bash_aliases || echo "alias $alias" >>~vagrant/.bash_aliases
+	done
+}
+
+main() {
+	local host_ip=$1
+
+	update_apt
+	install_docker
+	install_docker_compose
+
+	setup_layer2_network "$host_ip"
+
+	docker-compose -f /heckler/docker-compose/docker-compose.yml up -d
+
+	tweak_bash_interactive_settings
+}
+
+if [[ ${BASH_SOURCE[0]} == "$0" ]]; then
+	set -euxo pipefail
+
+	main "$@"
+	echo "all done!"
+fi