[llvm] [CI][Github] Install Clang in Windows container (PR #164519)

[via llvm-commits]

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@@ -98,3 +98,37 @@ RUN powershell -Command \
     Add-Type -AssemblyName System.IO.Compression.FileSystem ; \
     [System.IO.Compression.ZipFile]::ExtractToDirectory('actions-runner-win.zip', $PWD) ;\
     rm actions-runner-win.zip
+
+# Download and extract Clang compiler.
+# Create directories, download, extract, and clean up all in one layer
+RUN powershell -Command \
+    # --- Setup directories --- \
+    Write-Host "Creating directories..."; \
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cmtice wrote:

Done

https://github.com/llvm/llvm-project/pull/164519