[GitHub CI] Caching (#772)

RouteHelper/sha256.ps1

@@ -0,0 +1,13 @@
+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