ci: package windows agent as WiX MSI

installer/setup.ps1

@@ -0,0 +1,25 @@
+param(
+  [string]$ServerId,
+  [string]$Token,
+  [string]$ServerUrl,
+  [string]$InstallDir
+)
+$cfgDir = Join-Path $env:ProgramData "vantage"
+New-Item -ItemType Directory -Force -Path $cfgDir | Out-Null
+$cfg = @"
+server_url: "$ServerUrl"
+server_id: "$ServerId"
+pre_reg_token: "$Token"
+agent_token: ""
+poll_interval: 30s
+tls: true
+"@
+Set-Content -Path (Join-Path $cfgDir "config.yaml") -Value $cfg -Encoding utf8
+# Lock down ACL: SYSTEM + Administrators only
+icacls (Join-Path $cfgDir "config.yaml") /inheritance:r /grant:r "SYSTEM:F" "Administrators:F" | Out-Null
+
+$nssm = Join-Path $InstallDir "nssm.exe"
+$exe  = Join-Path $InstallDir "vantage-agent.exe"
+& $nssm install VantageAgent $exe
+& $nssm set VantageAgent Start SERVICE_AUTO_START
+& $nssm start VantageAgent