UEScripts/packageconfig_template.json

{
    "OutputDir": "/Path/To/Output/Parent/Dir",
    "ZipDir": "/Optional/Path/To/Zipped/Releases/Folder",

    "ProjectFile": "OptionalProjectFilenameWillDetectInDirOtherwise.uproject",

    "Target": "GameTargetName",
    "CookAllMaps": true,    
    "MapsIncluded": [
        "IfCookAllMapsIsFalse",
        "ListMapsToCookHere"
    ],
    "MapsExcluded": [
        "IfCookAllMapsIsTrue",
        "ListMapsToExcludeHere"
    ],
    "UsePak": true,

    "DefaultVariants": [
        "PrivateWin64Build"
    ],

    "Variants": [
        {
            "Name": "PrivateWin64Build", 
            "Platform": "Win64",
            "Configuration": "Development",
            "Zip": true,
            "ExtraBuildArguments": "-Any -Custom -Args=ToRunUAT -OrOtherCommandlets"
        },
        {
            "Name": "PublicWin64SteamBuild", 
            "Platform": "Win64",
            "Configuration": "Shipping",
            "SteamAppId": "YourSteamAppId",
            "SteamDepotId": "YourWindowsDepotId",
            "Zip": false,
            "ExtraBuildArguments": "-EnableSteamworks",
            "Cultures": [
                "ListOfCulturesToInclude",
                "IfNotSpecified",
                "WillUseProjectPackageSettings"
            ]
        },
        {
            "Name": "PublicWin64Build", 
            "Platform": "Win64",
            "Configuration": "Shipping",
            "ItchAppId": "itch-user/app-name",
            "ItchChannel": "win64",
            "Zip": false
        }
    ],

    "SteamLogin": "YourSteamReleaseUser"
}