Fix ephemeral runner deletion (#34447)

* repository deletion, delete ephemeral runners with active tasks as
well skips regular cleanup
* user deletion, delete ephemeral runners with active tasks as well
skips regular cleanup
* delete ephemeral runners once status changes to done
* You no longer see used ephemeral runners after the task is done
  * if you see one the cron job takes care of it

models/actions/task.go

@@ -336,6 +336,11 @@ func UpdateTask(ctx context.Context, task *ActionTask, cols ...string) error {
 		sess.Cols(cols...)
 	}
 	_, err := sess.Update(task)
+
+	// Automatically delete the ephemeral runner if the task is done
+	if err == nil && task.Status.IsDone() && util.SliceContainsString(cols, "status") {
+		return DeleteEphemeralRunner(ctx, task.RunnerID)
+	}
 	return err
 }