Feature: filter by hostname for Cyberghost servers

internal/updater/providers/cyberghost/hosttoserver.go

@@ -25,8 +25,9 @@ func getPossibleServers() (possibleServers hostToServer) {
 			const domain = "cg-dialup.net"
 			possibleHost := groupID + "-" + countryCode + "." + domain
 			possibleServer := models.CyberghostServer{
-				Region: region,
-				Group:  groupName,
+				Hostname: possibleHost,
+				Region:   region,
+				Group:    groupName,
 			}
 			possibleServers[possibleHost] = possibleServer
 		}

internal/updater/providers/cyberghost/sort.go

@@ -9,6 +9,9 @@ import (
 func sortServers(servers []models.CyberghostServer) {
 	sort.Slice(servers, func(i, j int) bool {
 		if servers[i].Region == servers[j].Region {
+			if servers[i].Group == servers[j].Group {
+				return servers[i].Hostname < servers[j].Hostname
+			}
 			return servers[i].Group < servers[j].Group
 		}
 		return servers[i].Region < servers[j].Region