Dunya Kirkali 0f64b1133e Add Nix flake for reproducible dev and CI/CD ...

- flake.nix pins the full toolchain (asciidoctor + pdf/epub3/diagram/
  mathematical, plantuml, graphviz, jre, vale, epubcheck) via bundlerEnv
- Gemfile/Gemfile.lock/gemset.nix lock the Ruby gems; work around the
  vendored mtex2MML cmake_minimum_required incompatibility
- 'nix build' produces book.pdf + book.epub; 'nix develop' gives a shell
  where all existing make targets work
- CI/CD workflows now install Nix and build/lint/validate through the flake
- devcontainer uses Nix; add .envrc for direnv; document in README

Co-authored-by: Shelley <shelley@exe.dev>

2026-08-08 22:27:23 +02:00

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