feat: schedule persistent archive jobs with console management

internal/retention/job_lock_unix.go

@@ -21,7 +21,10 @@ func lockJob(root *os.Root) (*os.File, error) {
 	}
 	if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil {
 		f.Close()
-		return nil, errors.New("archive job is locked or filesystem does not support locking")
+		if errors.Is(err, syscall.EWOULDBLOCK) || errors.Is(err, syscall.EAGAIN) {
+			return nil, ErrArchiveBusy
+		}
+		return nil, errors.New("archive filesystem does not support locking")
 	}
 	return f, nil
 }