feat(worker): add '-4' option to rsync when 'use_ipv6' is false

worker/rsync_provider.go

@@ -49,6 +49,8 @@ func newRsyncProvider(c rsyncConfig) (*rsyncProvider, error) {
 
 	if c.useIPv6 {
 		options = append(options, "-6")
+	} else {
+		options = append(options, "-4")
 	}
 
 	if c.excludeFile != "" {