Merge pull request #5314 from unisonweb/always-print-nix-df-output

always print `df` output in nix workflow

.github/workflows/nix-dev-cache.yaml

@@ -46,4 +46,5 @@ jobs:
     - name: build all packages and development shells
       run: nix -L build --accept-flake-config --no-link --keep-going '.#all'
     - name: print disk free status
+      if: always()
       run: df -h