Add Windows jpackage native installer build script

Author: mearvk

installer/build-native.ps1

@@ -0,0 +1,12 @@
+[CmdletBinding()]
+param([switch]$SkipMaven)
+$ErrorActionPreference = 'Stop'
+Set-Location $PSScriptRoot
+if (-not $SkipMaven) { mvn -B clean package }
+$version = (mvn -q -DforceStdout help:evaluate '-Dexpression=project.version').Trim()
+$jar = "target\us-house-installer-$version.jar"
+if (-not (Test-Path $jar)) { throw "Build did not produce $jar" }
+New-Item -ItemType Directory -Force -Path dist | Out-Null
+jpackage --type app-image --name US-House-Installer --input target --main-jar (Split-Path $jar -Leaf) --main-class us.house.installer.USHouseInstaller --dest dist
+jpackage --type exe --name US-House-Installer --input target --main-jar (Split-Path $jar -Leaf) --main-class us.house.installer.USHouseInstaller --dest dist
+Write-Host "Native Windows installer written to $PSScriptRoot\dist"