Add packer config for hetzner cloud image

packer/hcloud_image.json

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+{
+  "variables": {
+    "hcloud_token": "{{env `HCLOUD_TOKEN`}}"
+  },
+  "builders": [
+    {
+      "type": "hcloud",
+      "token": "{{user `hcloud_token` }}",
+      "image": "ubuntu-16.04",
+      "location": "nbg1",
+      "server_type": "cx11",
+      "ssh_username": "root",
+      "server_name": "hetzner-robot-api-mock-{{timestamp}}",
+      "snapshot_name": "hetzner-robot-api-mock-{{timestamp}}",
+      "snapshot_labels": {"type": "hetzner-robot-api-mock"}
+    }
+  ],
+  "provisioners": [
+    {
+      "type": "shell",
+      "script": "hcloud_provisioner.sh"
+    }
+  ]
+}

packer/hcloud_provisioner.sh

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+#!/bin/bash
+sudo apt-get update
+sudo apt-get -y install \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    gnupg-agent \
+    software-properties-common
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+sudo apt-key fingerprint 0EBFCD88
+sudo add-apt-repository \
+   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+   $(lsb_release -cs) \
+   stable"
+sudo apt-get update
+sudo apt-get -y install docker-ce docker-ce-cli containerd.io
+sudo service docker start
+docker run -d --restart always -p 3000:3000 --name hetzner-robot nl2go/hetzner-robot-api-mock:1.2.3