fix(services:nextcloud): add license

Author: SapphoSys

services/nextcloud/default.nix

@@ -17,6 +17,7 @@
       dav_push = pkgs.fetchNextcloudApp {
         appName = "dav_push";
         appVersion = "1.0.1";
+        license = "AGPL-3.0-only";
         sha512 = "29b9d9a741709bad372453519be74a5661c0018c0fef135db3fef78117d8b6a2c20563b5b97bc73567f577143b695749806529fbcff4f4559ed428456c19453b";
         url = "https://github.com/bitfireAT/nc_ext_dav_push/releases/download/v1.0.1/dav_push.tar.gz";
       };