List LLVM dir.

Author: nkoukpaizan

.github/workflows/spack_default_build.yaml

@@ -137,6 +137,9 @@ jobs:
                       cxx: /usr/lib/llvm-16/bin/clang++
           EOF
 
+      - name: Check LLVM compilers
+        run: ls /usr/lib/llvm-16/bin/
+
       - name: Configure GHCR mirror
         run: spack -e . mirror set --oci-username ${{ env.USERNAME }} --oci-password "${{ secrets.GITHUB_TOKEN }}" local-buildcache