Automated updates aren't yet available. There is a public preview of the Gateway manageent Powershell module. It offers initial installation and some management/configuration, but doesn't include updates yet: https://learn.microsoft.com/en-us/powershell/module/datagateway/install-datagateway?view=datagateway-ps
There is more info about the module in the preview announcement from the Power BI team (the same gateway software is used for multiple services including Power BI): https://community.powerbi.com/t5/Community-Blog/Data-Gateway-Automation-using-PowerShell-Part-1/ba-p/1117330