Fixes missing stdenv

Merge pull request #41 from inscapist/support-jemalloc

buildRubyGem should inherit the provided ruby

Update README

Update flake.lock

Update bundix - allow fresh start without gemset.nix

Update bundix version to 0.0.2

Update flake and bundix input

Merge pull request #12 from sagittaros/bundler-setup-check

We need GEM_HOME for git sources

Add workflow.yml