Introduce nix and just for reproducible CI locally

[expelledboy]

The goal is to allow dev to quickly become productive, and be able to execute exactly what is run during CI before they submit a PR.

• Nix Integration:

  • Added .envrc for direnv integration with use flake to load the Nix environment.
  • Introduced flake.nix and flake.lock to define and lock dependencies.
  • Updated .gitignore to include .direnv, which is generated by Direnv and Nix workflow.

• Just Task Runner:

  • Added justfile to define reproducible commands for tasks such as:
    • init: Installs node dependencies if node_modules does not exist.
    • lint: Runs linting on the codebase.
    • build: Compiles the project.
    • test: Typechecks and tests the project.
    • ci: Comprehensive task that runs init, build, lint, and test stages.

• Updates to Pre-commit Hook:

  • Added the pre-push hook in package.json to run jest -o. This ensures that only changed files before a remote push.

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Latest commit: 4621294

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[Andarist]

While those tools look useful and all… I think this is a maintenance burden for the core contributors (as far as I know none of us use those tools). This repo is using pretty standard JS tooling and reproducibility has not been a problem so far