feat: add the possibility of a discogsUrl onto a track

Author: Hugo Vieilledent

README.md

@@ -142,6 +142,7 @@ todo: explain our integration of the Cloudinary service.
 |url|`string`|the URL pointing to the provider serving the track media (YouTube only). Example: `"https://www.youtube.com/watch?v=5R5bETC_wvA"`|
 |ytid|`string`|provider id of a track media (YouTube only). Example: `"5R5bETC_wvA"`|
 |mediaNotAvailable|`boolean`|is the current track media available, accessible to be consumed|
+|discogsUrl|`string`|the URL pointing to the Discogs release (or master) corresponding to this track media. Example: `"https://www.discogs.com/Nu-Guinea-Nuova-Napoli/master/1334042"`|
 
 ## Node.js API
 

database.rules.json

@@ -226,6 +226,9 @@
 				"url": {
 					".validate": "newData.isString() && newData.val().length > 3"
 				},
+				"discogsUrl": {
+					".validate": "newData.isString() && newData.val().length > 3"
+				},
 				"title": {
 					".validate": "newData.isString() && newData.val().length > 0"
 				},