packer.conf

{
  "builders": [
    {
      "type": "amazon-ebs",
      "region": "us-east-1",
      "source_ami": "ami-8cb8e7e4",
      "instance_type": "t2.micro",
      "ssh_username": "ubuntu",
      "ami_name": "packer-quick-start {{timestamp}}",
      "ami_regions": [
        "us-east-1",
        "us-west-2",
        "eu-west-1"
      ],
      "ami_users": [
        "<aws_account_1>",
        "<aws_account_2>"
      ]
    }
  ],

  "provisioners": [
    {
      "type": "shell",
      "script": "setup.sh",
      "execute_command": "chmod +x {{ .Path }}; {{ .Vars }} sudo -E sh {{ .Path }}"
    }
  ]
}