Add Tensorflow managed through Poetry environment

tensorflow-poetry.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+mkShell {
+  buildInputs = [ python38 poetry ];
+  shellHook = ''
+    export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH
+    unset SOURCE_DATE_EPOCH
+  '';
+}