Fix: Move $osArchitecture initialization before first usage in Get-TerraformTool.ps1

Co-authored-by: jaredfholgate <1612200+jaredfholgate@users.noreply.github.com>

Author: Copilot

src/ALZ/Private/Tools/Get-TerraformTool.ps1

@@ -39,19 +39,19 @@ function Get-TerraformTool {
         }
     }
 
+    $osArchitecture = Get-OSArchitecture
+
     $unzipdir = Join-Path -Path $toolsPath -ChildPath "terraform_$version"
     if (Test-Path $unzipdir) {
         Write-Verbose "Terraform $version already installed, adding to Path."
-        if($os -eq "windows") {
+        if($osArchitecture.os -eq "windows") {
             $env:PATH = "$($unzipdir);$env:PATH"
         } else {
             $env:PATH = "$($unzipdir):$env:PATH"
         }
         return
     }
 
-    $osArchitecture = Get-OSArchitecture
-
     $zipfilePath = "$unzipdir.zip"
 
     $url = $release.builds | Where-Object { $_.arch -eq $osArchitecture.architecture -and $_.os -eq $osArchitecture.os } | Select-Object -First 1 -ExpandProperty url