Fake a local Debian repository for Modrinth

enable_modrinth_apt.sh

# inspired by https://gist.github.com/onjin/ef1ba348b2ff79808811e280df2d263c

#!/bin/bash

debdir=/usr/local/modrinthdebs
aptconf=/etc/apt/apt.conf.d/100update_modrinth
sourcelist=/etc/apt/sources.list.d/modrinthdebs.list

sudo apt install wget curl
# https://modrinth.com/app couldn't be parsed without JS, hence the workaround to use this Arch repo
sudo mkdir -p $debdir
( echo 'APT::Update::Pre-Invoke {"cd '$debdir' && wget -qN `curl -s https://aur.archlinux.org/packages/modrinth-app-bin 2>&1 | grep -P -m 1 -o 'https://.*?amd64.deb' | head -1` && apt-ftparchive packages . > Packages && apt-ftparchive release . > Release";};' | sudo tee $aptconf
  echo 'deb [trusted=yes lang=none] file:'$debdir' ./' | sudo tee $sourcelist
) >/dev/null

sudo apt update
sudo apt install modrinth-app