[GitHub CI] Update build.yml

Redirector/sha256.ps1

@@ -1,13 +0,0 @@
-Push-Location (Split-Path $MyInvocation.MyCommand.Path -Parent)
-
-$ms = [System.IO.MemoryStream]::new();
-$wr = [System.IO.StreamWriter]::new($ms);
-Get-ChildItem -Path '.' -File | ForEach-Object {
-    $name=$_.Name
-
-    $wr.Write((Get-FileHash -Path ".\$name" -Algorithm SHA256).Hash.ToLower())
-}
-$ms.Position = 0
-
-Write-Output (Get-FileHash -InputStream $ms).Hash.ToLower()
-Pop-Location