`legacyPackages` are not filtered by system and so will contain invalid
derivations. If something in legacyPackages should be explicitly built
add it to the `checks` output.
- [x] refactor lib into separate files, similar to NixOS/nixpkgs/lib.
- [x] refactor ci to automatically generate derivations from flake outputs
- [x] remove cluttered indirection statements throughout the codebase
- [x] refactor hosts to allow for upcoming integration tests
- [x] improve ambiguity in the existing docs
- [x] add [BORS](https://bors.tech) support
- [x] add initial integration test
- [x] write tests documentation
- [x] test lib
- [x] improve version string generation, and do so automatically for pkgs/flake.nix sources
Clean up the codebase as best we can in preparation for #152 and add tests. From now on, all PRs will be merged with BORS.
* Build a nixos configuration with all profiles available as part of ci
pipeline.
* Remove darwin packages as we do not have a ci agent for them.
* Build shell as part of ci
