Run nix-info

Author: ibbem

.github/workflows/maven.yml

@@ -22,6 +22,8 @@ jobs:
       with:
         key: nix-${{ hashFiles('.github/workflows/maven.yml', 'default.nix', 'nix/**', 'pom.xml', 'local-maven-repo') }}
         nix_file: nix/github-workflow-dependencies.nix
+    - name: test sandbox
+      run: nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/6832d0d99649db3d65a0e15fa51471537b2c56a6.tar.gz -p nix-info --run 'nix-info --markdown'
     - name: Build
       run: nix-build
     - name: Upload Javadoc artifact