Move llvm download to host machine

.gitea/workflows/publish-image.yaml

@@ -38,6 +38,20 @@ jobs:
       - name: Make scripts executable
         run: chmod +x *.sh
 
+        # --- NEW STEP: Download on Host ---
+      - name: Pre-download LLVM Toolchain
+        run: |
+          # Variable MUST match what is in build-windows.sh
+          LLVM_VER="20250528"
+          TARBALL="llvm-mingw-${LLVM_VER}-ucrt-ubuntu-22.04-x86_64.tar.xz"
+          URL="https://github.com/mstorsjo/llvm-mingw/releases/download/${LLVM_VER}/${TARBALL}"
+          
+          echo "Downloading $TARBALL on runner host..."
+          wget "$URL"
+          
+          echo "Verifying file size..."
+          ls -lh "$TARBALL"
+
       - name: Build Windows Target
         uses: docker://quay.io/buildah/stable
         env: