singularity-tools: fix singularity run with bashInteractive

  e2fsprogs,

  util-linux,

  # Build inputs

  bash,

  bashInteractive,

  runtimeShell,

  singularity,

  storeDir ? builtins.storeDir,

            # Create runScript and link shell

            if [ ! -e bin/sh ]; then

              ln -s ${runtimeShell} bin/sh

              ln -s ${lib.getExe bashInteractive} bin/sh

            fi

            mkdir -p .singularity.d

            ln -s ${runScriptFile} .singularity.d/runscript