PowerShell script to get the most recent arduino firmware, for manual upload, with sha256 and md5 checksum's

Get-ArduinoFirmware.ps1

function Get-FileHash {

    param (
        [string] $File = $(throw 'a filename is required'),
        [string] $Algorithm = 'sha256'
    )
    
    $fileStream = [System.IO.File]::OpenRead((Resolve-Path $File))
    $hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
    $hash = $hasher.ComputeHash($fileStream)
    $fileStream.Close()
    $fileStream.Dispose()

    [System.BitConverter]::ToString($hash) -replace '-',''
}

$all_builds = Get-Item "$($env:temp)\build*"
$all_valid_builds = $all_builds | Where-Object { (Get-ChildItem $_) -ne $null }
$all_sorted_builds = $all_valid_builds | Sort-Object -Descending LastWriteTime
$most_recent_build = ($all_sorted_builds | Select-Object -First 1).Name
$hex_filename = (Get-ChildItem "$($env:temp)\$most_recent_build" *.hex | Select-Object -First 1).Name
$hex_path = "$($env:temp)\$most_recent_build\$hex_filename"
$sha256sum = Get-FileHash -File $hex_path -Algorithm 'sha256'
$md5sum = Get-FileHash -File $hex_path -Algorithm 'md5'

$hex_destination = "$(Get-Location)\program.hex"
Copy-Item $hex_path $hex_destination
$sha256sum > "$hex_destination.sha256"
$md5sum > "$hex_destination.md5"