ldc-groupe/config/robots-txt.php

<?php
return [
    'environments' => [
        'production' => [
            'paths' => [
                '*' => [
                    'disallow' => [
                        '/admin',
                        '*.pdf$'
                    ],
                    'allow' => []
                ],
            ],
            'sitemaps' => [
                'sitemap.xml'
            ]
        ],
        'staging' => [
            'paths' => [
                '*' => [
                    'disallow' => [
                        '/'
                    ]
                ]
            ]
        ]

    ]
];