Add horizon-gen-nix gitlab-ci module to horizon-ci

Smartypantsrequested to merge
add-horizon-gen-nix-module into master

Summary

  • Re-adds horizon-gen-nix as a reusable option in the horizon-ci module
  • horizon.ci.horizon-gen-nix.enable — enable the validation job
  • horizon.ci.horizon-gen-nix.version — configurable version (default: "0.14.0")
  • Consumers no longer need to inline the job in their ci/nix/ci.nix

Follow-up to: #7 (closed)

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