A Pterodactyl panel egg to automatically install the latest Portal version

egg-portal.json

{
    "_comment": "DO NOT EDIT: FILE GENERATED AUTOMATICALLY BY PTERODACTYL PANEL - PTERODACTYL.IO",
    "meta": {
        "version": "PTDL_v1",
        "update_url": null
    },
    "exported_at": "2021-01-24T15:37:39-05:00",
    "name": "Portal",
    "author": "twistedasylummc@gmail.com",
    "description": "Portal is a lightweight transfer proxy written in Go for Minecraft: Bedrock Edition that is developed and maintained by Paroxity.",
    "features": null,
    "images": [
        "quay.io\/parkervcp\/pterodactyl-images:base_ubuntu"
    ],
    "file_denylist": "",
    "startup": ".\/portal",
    "config": {
        "files": "{}",
        "startup": "{\r\n    \"done\": \"Listening on \"\r\n}",
        "logs": "{}",
        "stop": "^C"
    },
    "scripts": {
        "installation": {
            "script": "#!\/bin\/bash\r\n\r\napt update\r\napt install -y curl\r\n\r\nif [ ! -d \/mnt\/server ]; then\r\n    mkdir \/mnt\/server\r\nfi\r\n\r\ncd \/mnt\/server\r\n\r\ncurl -sSL -o portal  https:\/\/github.com\/Paroxity\/portal\/releases\/latest\/download\/portal_linux_amd64\r\nchmod u+x portal",
            "container": "debian:buster-slim",
            "entrypoint": "bash"
        }
    },
    "variables": []
}

What is this