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❄️ Add Nix flake and pre-commit hooks
Setting up the different tools for development can be hard for new contributors. This commit adds a Nix flake that provides a reproducible development environment which is easy to set up and ensures consistent code style across all subprojects.
The initial flake contains git, pre-commit, which and bazelisk wrapped as a bazel executable. Dependencies like Rust, Scala etc may be added in the packages attribute in the future.
The current pre-commit configuration is a no-op. Future commits may enable the currently disabled parts of pre-commit-hooks.nix for a gradual transition.
Supports (x86_64|aarch64) (Linux|MacOS) systems.
This also allows rather straightforward integration with GitHub actions. See https://github.com/eomii/rules_ll/blob/main/.github/workflows/pre-commit.yml for an example that uses the same logic as implemented in this flake to run the hooks from a repo-local GitHub action cache.
