[windows] create powershell modules cache permanently

PSModuleAnalysisCachePath points to modules analysis cache. By default
it is stored in user profile. We create user every time, and module
analysis cache rebuild takes ~20s.

by storing cache in permanent location, initial powershell startup
takes ~8s instead of ~20s

Author: ilia-shipitsin

images/win/scripts/Installers/Configure-PowerShell.ps1

@@ -9,6 +9,15 @@ Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
 
 # Specifies the installation policy
 Set-PSRepository -InstallationPolicy Trusted -Name PSGallery
+
+Write-Host 'Warmup PSModuleAnalysisCachePath (speedup first powershell invocation by 20s)'
+$PSModuleAnalysisCachePath = 'C:\PSModuleAnalysisCachePath\ModuleAnalysisCache'
+
+[Environment]::SetEnvironmentVariable('PSModuleAnalysisCachePath', $PSModuleAnalysisCachePath, [System.EnvironmentVariableTarget]::Machine)
+# make variable to be available in the current session
+${env:PSModuleAnalysisCachePath} = $PSModuleAnalysisCachePath
+
+$null = New-Item -Path $PSModuleAnalysisCachePath  -ItemType 'File'  -Force
 #endregion
 
 #region User (current user, image generation only)