Arch build: add debug logging to investigate bad ICD path

Author: azonenberg

.github/workflows/build-arch.yml

@@ -144,6 +144,7 @@ jobs:
     - name: Run Tests
       if: ${{ !  matrix.docs }}
       run: |
+        ls -lh /usr/share/vulkan/icd.d/
         export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/lvp_icd.x86_64.json
         cd build
         ctest --output-on-failure