This will eliminate the need to download ffmpeg.
Fixed based on this comment on github: iawia002/lux#1193 (comment)
create the downloads
and mp3ed
directories for the services' volumes to be mounted
docker build -t lux .
docker run --rm lux -i "https://www.youtube.com/watch?v=dQw4w9WgXcQ"
docker compose up --build