Use $Env:CARGO_HOME in ps1 install script

[CAD97]

I have $env:CARGO_HOME set and just had this warning tell me I was missing the wrong path from my path. This makes the ps1 script do the same thing as the sh script and look in $env:CARGO_HOME if present.

I originally used ?? to null coalesce, but switched to just an if expression since ?? was only added in pwsh 7 (PowerShell Core, the cross platform one you need to install), thus isn't available in Windows Powershell. The if works in Windows PowerShell as well.

[CAD97]

PS C:\Users\CAD> $cargo_home = if ($Env:CARGO_HOME -ne $null) { $Env:CARGO_HOME } else { "$HOME\.cargo" }
PS C:\Users\CAD> $Env:Path -split ";" -notcontains "$cargo_home\bin"
False
PS C:\Users\CAD> $Env:Path -split ";" -notcontains "$HOME\.cargo\bin"
True

[NobodyXu]

Thank you!