magento2-docker/pub/media/composer.json

{
    "name": "magento/sample-data-media",
    "description": "Sample Data media files",
    "type": "magento2-component",
    "extra": {
        "map": [
            [
                "*",
                "pub/media"
            ]
        ]
    },
    "version": "100.4.0"
}