Merge pull request #1385 from mdorman/flake

flake.nix: include `serena-hooks` in package

flake.nix

@@ -100,6 +100,7 @@
           } ''
           mkdir -p $out/bin
           ln -s ${packages.serena-env}/bin/serena $out/bin/serena
+          ln -s ${packages.serena-env}/bin/serena-hooks $out/bin/serena-hooks
         '';
         default = packages.serena;
       };