ci: re-add powershell script for windows release builds (llvm#1561)

This file was removed as part of the PR that added build caching for
Windows.

build_tools/python_deploy/build_windows.ps1

@@ -0,0 +1,24 @@
+# Uncomment if you want to install Python. GHA provides this
+
+#Write-Host "Installing python"
+
+#Start-Process choco 'install python --version=3.10.8' -wait -NoNewWindow
+
+#Write-Host "python installation completed successfully"
+
+#Write-Host "Reload environment variables"
+#$env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+#Write-Host "Reloaded environment variables"
+
+Write-Host "Installing Build Dependencies"
+python -m venv .\mlir_venv\
+.\mlir_venv\Scripts\activate
+pip install -r .\requirements.txt
+Write-Host "Build Deps installation completed successfully"
+
+Write-Host "Building torch-mlir"
+$env:CMAKE_GENERATOR='Ninja'
+$env:TORCH_MLIR_ENABLE_LTC='0'
+python -m pip wheel -v -w  wheelhouse ./  -f https://download.pytorch.org/whl/nightly/cpu/torch_nightly.html  -r whl-requirements.txt
+
+Write-Host "Build completed successfully"