Adding nix-ld to docker images allows you to run pre-compiled binaries that depend on dynamic libraries inside docker images. To achieve that:

1. Add pkgs.nix-ld to your docker image
2. Set Env in the image like so:

"NIX_LD_LIBRARY_PATH=${pkgs.lib.makeLibraryPath [ pkgs.stdenv.cc ]}"
''NIX_LD=${pkgs.lib.fileContents "${pkgs.stdenv.cc}/nix-support/dynamic-linker"}''

3. add

runAsRoot = ''
  mkdir /lib64
  ln -s /libexec/nix-ld /lib64/$(basename  $(< ${pkgs.stdenv.cc}/nix-support/dynamic-linker))
'';