fix loop sync cli

cmd/cli/commands/sync/sync.go

@@ -45,7 +45,12 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 		return subcommands.ExitFailure
 	}
 
+	done := make(map[string]struct{})
 	for _, r := range rs {
+		if _, ok := done[r.URL]; ok {
+			continue
+		}
+
 		cli, err := connect(remoteCred, r)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, "error: failed to connect to the remote:", err)
@@ -62,6 +67,7 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 			pg.Close()
 		}
 
+		done[r.URL] = struct{}{}
 		syncer := sync.NewSyncer(cli, p.Service)
 
 		syncer.SetStateCallback(func(s sync.State, g repository.Metadata) {