Use job group instead of parsing the task arguments

modules/backend/src/main/scala/docspell/backend/msg/JobDone.scala

@@ -13,7 +13,13 @@ import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
 import io.circe.{Decoder, Encoder}
 
 /** Message to notify about finished jobs. They have a final state. */
-final case class JobDone(jobId: Ident, task: Ident, args: String, state: JobState)
+final case class JobDone(
+    jobId: Ident,
+    group: Ident,
+    task: Ident,
+    args: String,
+    state: JobState
+)
 object JobDone {
   implicit val jsonDecoder: Decoder[JobDone] =
     deriveDecoder[JobDone]