packer.json

{
  "variables": {
    "source_image_family": "ubuntu-1804-lts",
    "source_image_project_id": "ubuntu-os-cloud",
    "machine_type": "n1-standard-4",
    "disk_size": "50",
    "disk_type": "pd-ssd",
    "image_name": "gh-actions-image-{{timestamp}}",
    "image_family": "gh-actions-image",
    "ssh_username": "ubuntu",
    "region": "us-central1",
    "zone": "us-central1-a",
    "project_id": "{{env `PACKER_PROJECT_ID`}}",
    "gh_runner_version": "2.168.0"
  },
  "builders": [
    {
      "type": "googlecompute",
      "project_id": "{{user `project_id`}}",
      "source_image_family": "{{user `source_image_family`}}",
      "source_image_project_id": "{{user `source_image_project_id`}}",
      "zone": "{{user `zone`}}",
      "machine_type": "{{user `machine_type`}}",
      "disk_size": "{{user `disk_size`}}",
      "ssh_username": "{{user `ssh_username`}}",
      "image_name": "{{user `image_name`}}",
      "image_family": "{{user `source_image_family`}}",
      "disable_default_service_account": false,
      "metadata": {
        "enable-oslogin": "true",
        "new_nodes_topic": "new-instances-0001"
      }
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "environment_vars": ["DEBIAN_FRONTEND=noninteractive"],
      "inline": [
        "apt-get update",
        "apt-get dist-upgrade -y",
        "apt-get install -y apt-transport-https ca-certificates curl tar jq build-essential gnupg2 software-properties-common",
        "curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -",
        "add-apt-repository \"deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable\"",
        "apt-get update",
        "apt-get install -y docker-ce",
        "usermod -aG docker ubuntu"
      ],
      "execute_command": "sudo -S sh -c '{{ .Vars }} {{ .Path }}'"
    },
    {
      "type": "shell",
      "environment_vars": ["DEBIAN_FRONTEND=noninteractive"],
      "inline": [
        "curl -o actions.tar.gz --location \"https://github.com/actions/runner/releases/download/v{{user `gh_runner_version`}}/actions-runner-linux-x64-{{user `gh_runner_version`}}.tar.gz\"",
        "mkdir /runner",
        "mkdir /runner-tmp",
        "tar -zxf actions.tar.gz --directory /runner",
        "rm -f actions.tar.gz",
        "/runner/bin/installdependencies.sh"
      ],
      "execute_command": "sudo -S sh -c '{{ .Vars }} {{ .Path }}'"
    }
  ]
}