Changed the outputDir to /public and the adapter to auto in order to deploy the app on Vercel. Not sure if it still works in a Docker environment.
Clone the repositiory on your machine and run:
pnpm i
to install the required dependencies, after that you can run:
pnpm run dev
This will serve the app on this url which would be enough to start downloading mp3 from Youtube links.
git clone https://github.com/MyLastSerenade/svelteytdl.git
cd svelteytdl
docker build -t svelteytdl -f /home/USERNAME/svelteytdl/Dockerfile /home/USERNAME/svelteytdl
sudo docker-compose up -d