Prepare tester feedback and reproducible alpha builds

packaging/windows/build.ps1

@@ -0,0 +1,44 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$GodotExe,
+
+    [Parameter(Mandatory = $true)]
+    [string]$MakeNsisExe
+)
+
+$ErrorActionPreference = "Stop"
+$projectRoot = (Resolve-Path (Join-Path $PSScriptRoot "..\..")).Path
+$gameExe = Join-Path $projectRoot "build\windows\Void-Bastion.exe"
+$installer = Join-Path $projectRoot "dist\Void-Bastion-Setup-x64.exe"
+$installerScript = Join-Path $PSScriptRoot "installer.nsi"
+
+foreach ($requiredFile in @($GodotExe, $MakeNsisExe, $installerScript)) {
+    if (-not (Test-Path -LiteralPath $requiredFile -PathType Leaf)) {
+        throw "Benötigte Datei fehlt: $requiredFile"
+    }
+}
+
+New-Item -ItemType Directory -Force -Path (Split-Path $gameExe), (Split-Path $installer) | Out-Null
+
+& $GodotExe --headless --path $projectRoot --export-release "Windows x64" $gameExe
+if ($LASTEXITCODE -ne 0 -or -not (Test-Path -LiteralPath $gameExe)) {
+    throw "Der Godot-Windows-Export ist fehlgeschlagen."
+}
+
+Push-Location $PSScriptRoot
+try {
+    & $MakeNsisExe $installerScript
+    if ($LASTEXITCODE -ne 0 -or -not (Test-Path -LiteralPath $installer)) {
+        throw "Die Installer-Erstellung mit NSIS ist fehlgeschlagen."
+    }
+}
+finally {
+    Pop-Location
+}
+
+$installerFile = Get-Item -LiteralPath $installer
+$hash = Get-FileHash -Algorithm SHA256 -LiteralPath $installer
+Write-Host "Windows-Installer erfolgreich erstellt:"
+Write-Host "  Datei:  $($installerFile.FullName)"
+Write-Host "  Größe:  $([math]::Round($installerFile.Length / 1MB, 1)) MiB"
+Write-Host "  SHA256: $($hash.Hash)"