image_url. When the download is finished, the newly downloaded tarball will overwrite the existing environment.422 Unprocessable Entity response.curl --location --request POST 'https://service1.exmaple.com/admin/pre-receive-environments//downloads'{
"url": "https://github.example.com/api/v3/admin/pre-receive-environments/3/downloads/latest",
"state": "not_started",
"downloaded_at": null,
"message": null
}