Update the local libray index (arduino#133)

* update lib index during update

* Apply suggestions from code review

Co-authored-by: Davide <davideneri18@gmail.com>

---------

Co-authored-by: Luca Rinaldi <l.rinaldi@arduino.cc>
Co-authored-by: Davide <davideneri18@gmail.com>

Author: 3 people

internal/update/arduino/arduino.go

@@ -82,6 +82,15 @@ func (a *ArduinoPlatformUpdater) ListUpgradablePackages(ctx context.Context, _ f
 		return nil, err
 	}
 
+	streamLibIndex, _ := commands.UpdateLibrariesIndexStreamResponseToCallbackFunction(ctx, func(curr *rpc.DownloadProgress) {
+		slog.Debug("downloading library index", "progress", curr.GetMessage())
+	})
+
+	req := &rpc.UpdateLibrariesIndexRequest{Instance: inst}
+	if err := srv.UpdateLibrariesIndex(req, streamLibIndex); err != nil {
+		slog.Warn("error updating library index, skipping", slog.String("error", err.Error()))
+	}
+
 	if err := srv.Init(
 		&rpc.InitRequest{Instance: inst},
 		commands.InitStreamResponseToCallbackFunction(ctx, func(r *rpc.InitResponse) error {