add gunit tests to github action

Author: jpbruyere

.github/workflows/cmake.yml

@@ -36,7 +36,7 @@ jobs:
         shell: bash
     env:
       VULKAN_SDK: ${{ github.workspace }}/VulkanSDK/x86_64
-      VULKAN_LAYER_PATH: ${{env.VULKAN_SDK }}/share/vulkan/explicit_layer.d
+      VULKAN_LAYER_PATH: "${{ env.VULKAN_SDK }}/share/vulkan/explicit_layer.d"
 
     steps:
     - uses: actions/checkout@v4