Wrapper to Set-AuthenticodeSignature

SignScript.ps1

function Set-ScriptSignature {
    <# .SYNOPSIS
    Wrapper function to sign and timestamp a script file #>
    [Alias('SignScript')]
    Param(
        # The script file to sign
        [Parameter(Mandatory)]
        [String]$ScriptFile
    )

    Set-AuthenticodeSignature -FilePath $ScriptFile -Certificate (
        Get-ChildItem -Path Cert:\CurrentUser\My -CodeSigningCert
    )[0] -TimestampServer 'http://timestamp.digicert.com' #DevSkim: ignore DS137138
}

Updated version available in my HelperFunctions module.