AWS and DB link

[buzuloiu]

Currently, the app can get songs from the DB, or get them from AWS s3. The preferred flows for up/download are:

Uploading

1. Enter song info and file on form
2. Song is uploaded to S3
3. Webhook or whatever to download a URL for the song
4. Store the URL for the song in the Song entry in the database

Streaming

1. Load list of songs from DB
2. when user clicks play, the song is fetched from AWS and streamed

we need:

• a songs table with a file_url column
• a way to stream from a URL
• a way to pass the file from the upload form to the controller to be uploaded to S3
• a way to get the URL back from S3 after uploading it
• making sure than only admin users have access to the uploading endpoint