ci: use wix install from latest gstreamer ci image

.gitlab-ci.yml

@@ -107,7 +107,6 @@ windows installer stable:
   script:
     - git fetch --tags
     - "& ./ci/build_gps.ps1"
-    - "& ./installer/wix/prepare_wix.ps1"
     - "& ./installer/wix/prepare_gstreamer.ps1"
     - "& ./installer/wix/build_installer.ps1"
   artifacts:

installer/wix/build_installer.ps1

@@ -1,7 +1,19 @@
-$wixFolder = Join-Path $PSScriptRoot -ChildPath 'wix/'
+# Check wix installation
+$wixInstalledFolder = "C:\Program Files (x86)\Windows Installer XML v3.5\bin"
+if(Test-Path $wixInstalledFolder)
+{
+    $wixFolder = $wixInstalledFolder
+}
+else
+{
+    $prepareWix = Join-Path $PSScriptRoot -ChildPath prepare_wix.ps1
+    & "$prepareWix"
+    $wixFolder = Join-Path $PSScriptRoot -ChildPath 'wix/'
+}
 $candleToolPath = Join-Path $wixFolder -ChildPath candle.exe
 $lightToolPath = Join-Path $wixFolder -ChildPath light.exe
 $heatToolPath = Join-Path $wixFolder -ChildPath heat.exe
+
 $GPSUpgradeCode = "9B87C8FF-599C-4F20-914E-AF5E68CB3DC0"
 $GPSVersion = $(git describe --always --abbrev=0)
 Write-Output $GPSVersion