Update build-cmake.yml

Author: Mike-Leo-Smith

.github/workflows/build-cmake.yml

@@ -125,6 +125,9 @@ jobs:
           vulkan-query-version: 1.4.304.1
           vulkan-components: Vulkan-Headers, Vulkan-Loader
           vulkan-use-cache: true
+      - name: "Install DirectX 12 Agility SDK"
+        run: |
+          dotnet add package Microsoft.Direct3D.D3D12 --version 1.615.1
       - name: "Configure and Build"
         shell: cmd
         run: |