example.json

{
    "variables": {
      "client_id": "{{env `ARM_CLIENT_ID`}}",
      "client_secret": "{{env `ARM_CLIENT_SECRET`}}",
      "subscription_id": "{{env `ARM_SUBSCRIPTION_ID`}}",
      "resource_group": "{{env `ARM_RESOURCE_GROUP`}}"
    },
    "builders": [{
      "type": "azure-chroot",

      "client_id": "{{user `client_id`}}",
      "client_secret": "{{user `client_secret`}}",
      "subscription_id": "{{user `subscription_id`}}",
      "image_resource_id": "/subscriptions/{{user `subscription_id`}}/resourceGroups/{{user `resource_group`}}/providers/Microsoft.Compute/images/MyDebianOSImage-{{timestamp}}",
      "source": "credativ:Debian:9:latest"
    }],
    "provisioners": [{
      "inline": [
        "apt-get update",
        "apt-get upgrade -y"
      ],
      "inline_shebang": "/bin/sh -x",
      "type": "shell"
    }]
  }