[macOS] Switch image generation to faster datastores (#1801)

* select datastore script

* add debug message

* add move-vm and helpers

* add error action

* formatting the script

* nits

* add missing quotes

* add synopsis

images.CI/macos/select-datastore.ps1

@@ -0,0 +1,64 @@
+<#
+.SYNOPSIS
+
+This script selects local datastore based on the following rules:
+
+- Name starts with ds-local-Datastore
+- Datastore FreespaceGB > 400 Gb
+- VM count on the datastore < 2
+
+.PARAMETER VIServer
+vCenter address (Example "10.0.1.16")
+
+.PARAMETER VIUserName
+vCenter username (Example "Administrator")
+
+.PARAMETER VIPassword
+vCenter password (Example "12345678")
+#>
+
+
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory)]
+    [ValidateNotNullOrEmpty()]
+    [string]$VIServer,
+
+    [Parameter(Mandatory)]
+    [ValidateNotNullOrEmpty()]
+    [string]$VIUserName,
+
+    [Parameter(Mandatory)]
+    [ValidateNotNullOrEmpty()]
+    [string]$VIPassword
+)
+
+# Import helpers module
+Import-Module $PSScriptRoot\helpers.psm1 -DisableNameChecking
+
+# Connection to a vCenter Server system
+Connect-VCServer
+
+# Get a target datastore for current deployment
+# 1. Name starts with ds-local-Datastore
+# 2. FreespaceGB > 400 Gb
+# 3. VM count on a datastore < 2
+$templateDatastore = "ds-local-Datastore-*"
+$thresholdInGb = 400
+$vmCount = 2
+$allDatastores = Get-Datastore -Name $templateDatastore | Where-Object { $_.State -eq "Available" }
+$buildDatastore = $allDatastores | Where-Object { $_.FreeSpaceGB -ge $thresholdInGb } | Where-Object {
+            $vmOnDatastore = @((Get-ChildItem -Path $_.DatastoreBrowserPath).Name -notmatch "^\.").Count
+            $vmOnDatastore -lt $vmCount
+        } | Select-Object -ExpandProperty Name -First 1
+
+if ($buildDatastore)
+{
+    Write-Host "Datastore selected successfully"
+    Write-Host "##vso[task.setvariable variable=buildDatastore;issecret=true]$buildDatastore"
+}
+else
+{
+    Write-Host "##vso[task.LogIssue type=error;]No datastores found for the condition"
+    exit 1
+}