add copyright text to all our files

packages/backend/migration/1691264431000-add-lb-to-user.js

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: amelia and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 export class AddLbToUser1691264431000 {
 	name = "AddLbToUser1691264431000";
 
@@ -17,4 +22,4 @@ export class AddLbToUser1691264431000 {
             ALTER TABLE "user_profile" DROP COLUMN "listenbrainz"
         `);
 	}
-}
+}