bazzite/system_files/desktop/usr/bin/ublue-flatpak-system-install

#!/usr/bin/env bash

if [[ -f '/etc/flatpak/install' ]]; then
  export FLATPAK_SYSTEM_CACHE_DIR='/etc/flatpak/cache'
  cat /etc/flatpak/install | while read line; do
    flatpak install --system --noninteractive --no-pull flathub $line
  done && mv /etc/flatpak/install /etc/flatpak/installed
  unset FLATPAK_SYSTEM_CACHE_DIR
  rm -rf /etc/flatpak/cache
fi