[
    {
        "id": 144,
        "name": "sha256:c65058fa7519270.............",
        ....
        "metadata": {
            "package_type": "container",
            "container": {
                "tags": [
                    "latest"
                ]
            }
        }
    },
    {
        "id": 123,
        "name": "sha256:d3c4f........",
        .....
        "metadata": {
            "package_type": "container",
            "container": {
                "tags": []
            }
        }
    }
]

DELETE /user/packages/container/xxxx/versions/123

{
    "message": "You cannot delete the last tagged version of a package. You must delete the package instead.",
    "documentation_url": "https://docs.github.com/rest/reference/packages#delete-a-package-version-for-the-authenticated-user"
}