pre flatten for zip

Author: davegarthsimpson

.github/workflows/build.yml

@@ -484,12 +484,15 @@ jobs:
 
           mkdir "!dirname!"
           tar -xf "!zipfile!" -C "!dirname!"
-          
+
           "%SIGNTOOL_PATH%" sign -d "Arduino IDE" -f "%INSTALLER_CERT_WINDOWS_CER%" -csp "eToken Base Cryptographic Provider" -k "[{{%CERT_PASSWORD%}}]=%CONTAINER_NAME%" -fd sha256 -tr http://timestamp.digicert.com -td SHA256 -v "!dirname!\Arduino IDE.exe"
 
-          cd "!dirname!"
-          tar -a -cf "../!newzipfile!" .
-          cd ..
+          mkdir "!dirname!\flat"
+          for /r "!dirname!" %%i in (*) do (
+            if not "%%~pi"=="!dirname!\flat\" move "%%i" "!dirname!\flat\%%~nxi"
+          )
+
+          tar -a -cf "!newzipfile!" -C "!dirname!\flat" .
 
           rmdir /s /q "!dirname!"