Custom Mirror Server
To use a specific mirror server open the config.json in the root path of the cloned repo. You should see this configuration:
config.json
{
"server": "auto"
}
To use a custom mirror server change the server value to the url of the mirror server. Example:
config.json
{
"server": "https://api.gamehub.dev"
}
If you want to host your own mirror server see here.