diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 22f2200..8473e52 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,6 +15,9 @@ jobs:
       - uses: cachix/install-nix-action@v18
         with:
           nix_path: nixpkgs=channel:nixos-unstable
+      - run: |
+        ls
+        tree
       - name: Run tests
         run: nix-shell --run "with-pg-${{ matrix.pg-version }} make installcheck"
       - if: ${{ failure() }}