packer template for windows server 2019 oci packer builder

template.json

{
    "variables": {
        "user_ocid":"{{env `user_ocid`}}",
        "tenancy_ocid": "{{env `tenancy_ocid`}}",
        "fingerprint":"{{env `fingerprint`}}",
        "private_key_path":"{{env `private_key_path`}}",
        "private_key_password":"{{env `TF_VAR_private_key_password`}}", 
        "availability_domain": "uwhB:EU-FRANKFURT-1-AD-1",
        "region": "eu-frankfurt-1",
        "base_image_ocid": "ocid1.image.oc1.eu-frankfurt-1.redacted",
        "image_shape": "VM.Standard.E4.Flex",
        "compartment_ocid": "{{env `compartment_ocid`}}",
        "subnet_ocid": "ocid1.subnet.oc1.eu-frankfurt-1.redacted",
        "winrm_username": "opc",
        "winrm_password": "<redacted>"
    },  
  
    "builders": [
       {
        "user_ocid":"{{user `user_ocid`}}",
        "tenancy_ocid": "{{user `tenancy_ocid`}}",
        "fingerprint":"{{user `fingerprint`}}",
        "key_file":"{{user `private_key_path`}}",
        "pass_phrase":"{{user `private_key_password`}}",
        "availability_domain": "{{user `availability_domain`}}",
        "region": "{{user `region`}}",
        "base_image_ocid": "{{user `base_image_ocid`}}",
        "compartment_ocid": "{{user `compartment_ocid`}}",
        "shape_config": {
          "ocpus": 2,
          "memory_in_gbs": 16
        },
        "image_name": "windows-custom",
        "shape": "{{user `image_shape`}}",
        "communicator": "winrm",
        "winrm_username": "{{user `winrm_username`}}",
        "winrm_password": "{{user `winrm_password`}}",
        "winrm_use_ssl": true,
        "winrm_insecure": true,
        "winrm_no_proxy": true,
        "use_private_ip": false,
        "subnet_ocid": "{{user `subnet_ocid`}}",
        "user_data_file": "./cloudinit.ps1",
        "type": "oracle-oci"
      }
    ],
    "provisioners": [
       {
        "type": "ansible",
        "playbook_file": "./playbook.yml",
        "user": "opc",
        "use_proxy": false,
        "extra_arguments": ["-e", "ansible_winrm_server_cert_validation=ignore", "-vvvv"]
       },
       {
        "type": "powershell",
        "inline": [
          "& C:\\Windows\\Panther\\Generalize.cmd",
          "while($true) { $imageState = Get-ItemProperty HKLM:\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Setup\\State | Select ImageState; if($imageState.ImageState -ne 'IMAGE_STATE_GENERALIZE_RESEAL_TO_OOBE') { Write-Output $imageState.ImageState; Start-Sleep -s 10  } else { break } }"          
        ]
       }
    ]
  }