add error check

Author: SteveL-MSFT

build.ps1

@@ -571,10 +571,16 @@ if ($packageType -eq 'msixbundle') {
     $packageName = "DSC-$productVersion-$architecture.tar"
     $tarFile = Join-Path $PSScriptRoot 'bin' $packageName
     tar cvf $tarFile -C $tgzTarget .
+    if ($LASTEXITCODE -ne 0) {
+        throw "Failed to create tar file"
+    }
     Write-Host -ForegroundColor Green "`nTar file is created at $tarFile"
 
     $gzFile = "$tarFile.gz"
     gzip -c $tarFile > $gzFile
+    if ($LASTEXITCODE -ne 0) {
+        throw "Failed to create gz file"
+    }
     Write-Host -ForegroundColor Green "`nGz file is created at $gzFile"
 }