Local music storage

[thijstakken]

• Simple folder sync (since I am using truenas, I just need to mount my media folder inside the docker container, no webdav or anything)

Originally posted by @TimotheFCN in #47 (comment)

I (@thijstakken) will add a file based option to the music service also, so instead of choosing Webdav (which is the only option in the GUI right now) I will make an option for simple file based system. So you have a native option for your workflow with "simple folder sync", which will put the songs in a folder whithout any other logic.

This place can be added as an Docker volume to access the files.

[thijstakken]

I've made a static folder where all music will go.
This is handy so users can easily mount this path in their Docker environment.

It's like this:

/music/{username}/{playlistname}/songs.mp3

So the /music/ location can be mounted and will serve this structure.
If users want, they could also directly mount /music/{their username} so they have to click less

[thijstakken]

@TimotheFCN

The commit 2e3cd7d created the basic foundation for this feature just now

I will add some documentation, and make the GUI more friendly, but the backend is almost done now for this.