Tested on Pixel Slate running ChromeOS v81 using an ArchLinux container running through Crostini.
vim .env
See here for more info: https://hub.docker.com/r/dceschmidt/openvpn-client/
docker-compose build
chmod +x start-popcorn
./start-popcorn
vim popcorntime.desktop
cp popcorntime.desktop ~/.local/share/applications/
sudo cp Popcorn-Time.png /usr/share/icons/hicolor/512x512/apps/