serve podcasts via node/docker
usage:
docker build -t podcastslinger .
docker run -v /net/tower/mnt/user/media/podcasts/:/data -p 0.0.0.0:1989:3000 -d -e "PUBLICPORT=12345" -e "TITLE=Podcast title" -e "DESCRIPTION=A short description of the podcast" -e "HOST=my.example.com" podcastslinger
http://my.example.com:12345/rss http://my.example.com:12345/media/{data}