add Windows debug machine (#4370)

Today we don't have any Windows machine in the CI pool. The machine
template has not changed since 2019-11-21, yet as of today when the
machine starts GCP proudly declares

> GCEMetadataScripts: No startup scripts to run.

despite the script being defined as `sysprep-specialize-script-ps1`, as
per the
[documentation](https://cloud.google.com/compute/docs/startupscript).
Also, it used to work and we haven't changed anything.

I'm not quite sure what's going on and how to investigate, but I think
at the very least we can try to unblock the team by having a set of
machines we initialize manually. This PR is meant to do that.)

This is the same changeset as a877491139
and 16da700532, except that it now
specifies 5 machines instead of just one.

CHANGELOG_BEGIN
CHANGELOG_END

infra/TEMP-vsts_agent_windows_DEBUG.tf

@@ -0,0 +1,166 @@
+# Copyright (c) 2020 The DAML Authors. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+locals {
+  DEBUG_vsts_token   = "${secret_resource.vsts-token.value}"
+  DEBUG_vsts_account = "digitalasset"
+  DEBUG_vsts_pool    = "windows-pool-debug"
+}
+
+resource "google_compute_region_instance_group_manager" "vsts-agent-windows-TEMP_DEBUG" {
+  provider = "google-beta"
+  name     = "windows-debug"
+
+  # keep the name short. windows hostnames are limited to 12(?) chars.
+  # -5 for the random postfix:
+  base_instance_name = "windebug"
+
+  region      = "${local.region}"
+  target_size = 5
+
+  version {
+    name              = "windows-debug"
+    instance_template = "${google_compute_instance_template.vsts-agent-windows-DEBUG.self_link}"
+  }
+
+  update_policy {
+    type           = "PROACTIVE"
+    minimal_action = "REPLACE"
+
+    # minimum is the number of availability zones (3)
+    max_surge_fixed = 3
+
+    # calculated with: serial console last timestamp after boot - VM start
+    # 09:54:28 - 09:45:55 = 513 seconds
+    min_ready_sec = 520
+  }
+}
+
+resource "google_compute_firewall" "allow-rdp" {
+  name = "allow-rdp"
+  network = "default"
+
+  allow {
+    protocol = "tcp"
+    ports = ["3389"]
+  }
+  allow {
+    protocol = "udp"
+    ports = ["3389"]
+  }
+
+  target_tags = ["debugrdp"]
+}
+
+resource "google_compute_instance_template" "vsts-agent-windows-DEBUG" {
+  name_prefix  = "windows-debug-"
+  machine_type = "n1-standard-8"
+  labels       = "${local.labels}"
+  tags = ["debugrdp"]
+
+  disk {
+    disk_size_gb = 200
+    disk_type    = "pd-ssd"
+
+    # find the image name with `gcloud compute images list`
+    source_image = "windows-cloud/windows-2016"
+  }
+
+  # Drive D:\ for the agent work folder
+  disk {
+    disk_size_gb = 200
+    disk_type    = "pd-ssd"
+  }
+
+  lifecycle {
+    create_before_destroy = true
+  }
+
+  metadata {
+    // Prepare the machine
+    sysprep-specialize-script-ps1 = <<SYSPREP_SPECIALIZE
+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+
+# Disable Windows Defender to speed up disk access
+Set-MpPreference -DisableRealtimeMonitoring $true
+
+# Enable long paths
+Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\FileSystem' -Name LongPathsEnabled -Type DWord -Value 1
+
+# Disable UAC
+New-ItemProperty -Path HKLM:Software\Microsoft\Windows\CurrentVersion\policies\system -Name EnableLUA -PropertyType DWord -Value 0 -Force
+
+# Redirect logs to SumoLogic
+
+cd $env:UserProfile;
+Invoke-WebRequest https://dl.google.com/cloudagents/windows/StackdriverLogging-v1-9.exe -OutFile StackdriverLogging-v1-9.exe;
+.\StackdriverLogging-v1-9.exe /S /D="C:\Stackdriver\Logging\"
+
+# Install chocolatey
+iex (New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1')
+
+# Install git, bash
+& choco install git --no-progress --yes 2>&1 | %{ "$_" }
+& choco install windows-sdk-10.1 --no-progress --yes 2>&1 | %{ "$_" }
+
+# Add tools to the PATH
+$OldPath = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).path
+$NewPath = "$OldPath;C:\Program Files\Git\bin;C:\Program Files (x86)\Windows Kits\10\App Certification Kit"
+Set-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH -Value $NewPath
+
+echo "== Prepare the D:\ drive"
+
+$partition = @"
+select disk 1
+clean
+convert gpt
+create partition primary
+format fs=ntfs quick
+assign letter="D"
+"@
+$partition | Set-Content C:\diskpart.txt
+& diskpart /s C:\diskpart.txt 2>&1 | %{ "$_" }
+
+# Create a temporary and random password for the VSTS user, forget about it once this script has finished running
+$Username = "VssAdministrator"
+$Account = "$env:COMPUTERNAME\$Username"
+Add-Type -AssemblyName System.Web
+$Password = [System.Web.Security.Membership]::GeneratePassword(24, 0)
+
+echo "== Creating the VSTS user"
+
+#New-LocalUser $Username -Password $SecurePassword -FullName $Username
+net user $Username $Password /add /y
+# net localgroup administrators $Username /add
+Add-LocalGroupMember -Group "Administrators" -Member $Username
+
+winrm set winrm/config/winrs '@{MaxMemoryPerShellMB="2048"}'
+winrm set winrm/config '@{MaxTimeoutms="1800000"}'
+winrm set winrm/config/service/auth '@{Basic="true"}'
+net stop winrm
+sc.exe config winrm start=auto
+net start winrm
+
+echo "== Installing the VSTS agent"
+
+choco install azure-pipelines-agent --no-progress --yes --params "'/Token:${local.DEBUG_vsts_token} /Pool:${local.DEBUG_vsts_pool} /Url:https://dev.azure.com/${local.DEBUG_vsts_account}/ /LogonAccount:$Account /LogonPassword:$Password /Work:D:\a'"
+echo OK
+SYSPREP_SPECIALIZE
+
+    windows-shutdown-script-ps1 = "c://agent/config remove --unattended --auth PAT --token '${secret_resource.vsts-token.value}'"
+  }
+
+  network_interface {
+    network = "default"
+
+    // Ephemeral IP to get access to the Internet
+    access_config {}
+  }
+
+  scheduling {
+    automatic_restart   = false
+    on_host_maintenance = "TERMINATE"
+    preemptible         = false
+  }
+}