This is the Google Compute Engine install-driver file used for windows driver installation. I couldn't find it anywhere else online.

install-driver.ps1

#Copyright 2018 Google, Inc.  All Rights Reserved.

<#
.SYNOPSIS
  Script to install specific driver.
.DESCRIPTION
  Script will add certs from the driver to TrustedPublisher store and
  install driver with pnputil.

  NOTE: The script needs to be run with admin priviledge.
.PARAMETER Target
  The target driver to install. Required.
.PARAMETER Dev
  Whether to install a development version of the driver. Default to $false.
.EXAMPLE
  install-driver.ps1 -Target gvnic -Dev $false
  Install a development version of gvnic driver.
#>
param (
  [parameter(Mandatory=$true)]
  [ValidateSet('gvnic', 'netkvm', 'vioscsi', 'gga', 'pvpanic', 'balloon')]
  [string]$Target,
  [bool]$Dev = $false
)
$ErrorActionPreference = 'Stop'

if (!$PSScriptRoot) {
  $PSScriptRoot = Split-Path $MyInvocation.MyCommand.Path -Parent
}

Import-Module $PSScriptRoot\package-common.psm1 -Force

# https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/pnputil-return-values
$PNPUTIL_REBOOT_REQUIRED = 3010

Assert-AdminUser

function Install-DriverCert {
  param (
    [string]$DriverPath
  )
  $signature =  Get-AuthenticodeSignature $DriverPath;
  $cert = $signature.SignerCertificate;
  $store = New-Object -TypeName `
    System.Security.Cryptography.X509Certificates.X509Store `
    -ArgumentList `
    @([System.Security.Cryptography.X509Certificates.StoreName]::TrustedPublisher, `
    [System.Security.Cryptography.X509Certificates.StoreLocation]::LocalMachine);
  $store.Open([System.Security.Cryptography.X509Certificates.OpenFlags]::ReadWrite);
  $store.Add($cert);
  $store.Close()
}

Write-Output "Trying to install driver for $Target"
if ($Dev) {
  Write-Output 'Development driver is selected.'
}
$package_install_folder = $MyInvocation.MyCommand.Path | Split-Path | Split-Path
$driver_folder = Get-PackageContentsFolder $Target -Dev $Dev
$driver_folder = Join-Path $package_install_folder $driver_folder
if (!(Test-Path $driver_folder)) {
  throw "$driver_folder not found. Not a supported Windows version."
}

Write-Output 'Install driver cert to TrustedPublisher.'
$sys_file = Get-ChildItem $driver_folder -Filter '*.sys'
Install-DriverCert $sys_file.FullName

Write-Output "Install driver from $driver_folder"
$inf_file = Get-ChildItem $driver_folder -Filter '*.inf'
& pnputil -i -a $inf_file.FullName

if ($LASTEXITCODE -eq $PNPUTIL_REBOOT_REQUIRED) {
  Write-Warning 'Driver installation completed successfully but a manual reboot is required.'
  exit 0
}
elseif ($LASTEXITCODE -ne 0) {
  Write-Output 'Driver installation failed.'
  exit 1
}

if ($Target -eq 'gvnic' -and (Test-Path "${driver_folder}\gvnichelper.dll")) {

 Import-Module $PSScriptRoot\gvnic_helper.psm1

 Write-Output 'Register gvnic_helper.'
 $HelperPath = "${env:ProgramFiles}\Google\Compute Engine\gvnic_helper"

 if (!(Test-Path $HelperPath)) {
   New-Item $HelperPath -Type Directory
 }

 & robocopy $driver_folder $HelperPath gvnichelper.dll /r:5 /w:1 /np /fp /njh /ndl /nfl /njs /nc /ns

 $DllPath = Join-Path $HelperPath 'gvnichelper.dll'

 Register-Helper $DllPath
}