List files (tree) instead of ls

Author: tyeth

.github/workflows/build-clang-doxy.yml

@@ -222,10 +222,9 @@ jobs:
       - name: Build for ESP32-SX
         run: |
           python3 ci/build_platform.py ${{ matrix.arduino-platform }} --build_timeout 48000 --include_print_dependencies_header
-      - name: list
+      - name: list files (tree)
         run: |
-          ls
-          ls examples/*/build/
+          tree
       - name: Rename build artifacts to reflect the platform name
         run: |
           mv examples/*/build/*/Wippersnapper_demo.ino.uf2 wippersnapper.${{ matrix.arduino-platform }}.${{ env.WS_VERSION }}.uf2