ci/windows: Enable developer mode for test container

Reviewed-by: Giancarlo Devich <gdevich@microsoft.com>
Reviewed-by: Sil Vilerino <sivileri@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19178>

.gitlab-ci/windows/mesa_deps_test.ps1

@@ -169,5 +169,16 @@ Expand-Archive -Path 'DXC.zip' -DestinationPath 'C:\DXC'
 # No more need to get dxil.dll from the VS install
 Copy-Item 'C:\DXC\bin\x64\*.dll' -Destination 'C:\Windows\System32'
 
+Get-Date
+Write-Host "Enabling developer mode"
+# Create AppModelUnlock if it doesn't exist, required for enabling Developer Mode
+$RegistryKeyPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock"
+if (-not(Test-Path -Path $RegistryKeyPath)) {
+    New-Item -Path $RegistryKeyPath -ItemType Directory -Force
+}
+
+# Add registry value to enable Developer Mode
+New-ItemProperty -Path $RegistryKeyPath -Name AllowDevelopmentWithoutDevLicense -PropertyType DWORD -Value 1 -Force
+
 Get-Date
 Write-Host "Complete"