build: preserve dist directory and merge SHA256 sums in package-release.ps1

scripts/package-release.ps1

@@ -55,8 +55,11 @@ $PackageName = "sanctum-v$Version-windows-x86_64"
 $StagingDir = Join-Path $DistDir $PackageName
 $ZipFile = Join-Path $DistDir "$PackageName.zip"
 
-if (Test-Path $DistDir) {
+if (-not (Test-Path $DistDir)) {
-    Remove-Item $DistDir -Recurse -Force
+    New-Item -ItemType Directory -Path $DistDir -Force | Out-Null
+}
+if (Test-Path $StagingDir) {
+    Remove-Item $StagingDir -Recurse -Force
 }
 New-Item -ItemType Directory -Path $StagingDir -Force | Out-Null
 
@@ -84,7 +87,17 @@ $ZipHash = (Get-FileHash -Path $ZipFile -Algorithm SHA256).Hash.ToLower()
 $ExeHash = (Get-FileHash -Path $ExeSource -Algorithm SHA256).Hash.ToLower()
 
 $ChecksumFile = Join-Path $DistDir "SHA256SUMS.txt"
-@("$ZipHash  $PackageName.zip", "$ExeHash  sanctum.exe") | Set-Content -Path $ChecksumFile -Encoding utf8
+$ExistingLines = if (Test-Path $ChecksumFile) {
+    Get-Content $ChecksumFile | Where-Object { $_ -notmatch "$PackageName\.zip" -and $_ -notmatch "\s+sanctum\.exe$" }
+} else {
+    @()
+}
+
+$AllLines = @()
+$AllLines += "$ZipHash  $PackageName.zip"
+$AllLines += "$ExeHash  sanctum.exe"
+$AllLines += $ExistingLines
+$AllLines | Set-Content -Path $ChecksumFile -Encoding utf8
 
 Write-Host "[OK] Pruefsummen in SHA256SUMS.txt gespeichert." -ForegroundColor Green