Add direnv, nix configs, and uv lock file

Author: yvan-sraka

.envrc

@@ -0,0 +1 @@
+use flake

.python-version

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+/nix/store/qrc496n6fsqp4p5m5h8wmw5d5jwyw5mr-python3-3.12.8/bin/python3

flake.lock

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+# How to setup this project?
+#
+# 1. Install Nix:
+#
+#     curl -sSf -L https://install.lix.systems/lix | sh -s -- install
+#
+# 2. Enter the reproducible developer shell:
+#
+#     nix develop
+#
+# 3. Sync your Python venv with uv.lock file:
+#
+#     uv sync
+#
+# Everything's good! You can also install http://direnv.net/ and enjoy automagic
+# activation of your environment ;)
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+  outputs = { flake-utils, nixpkgs, rust-overlay, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+      in {
+        devShell = import ./shell.nix { inherit pkgs system; };
+      });
+}

flake.nix

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+# If you plan to use `nix-shell` you have first to:
+#
+# $ nix-channel --add https://github.com/oxalica/rust-overlay/archive/master.tar.gz rust-overlay
+# $ nix-channel --update
+{ pkgs ? import <nixpkgs> { overlays = [ (import <rust-overlay>) ]; }
+, system ? builtins.currentSystem }:
+with pkgs;
+let
+  toolchain = (rust-bin.fromRustupToolchainFile ./rust-toolchain).override {
+    extensions = [ "rust-src" "rust-analyzer" "clippy" ];
+  };
+in mkShell {
+  buildInputs = [ gcc openssl pkg-config python3 uv ];
+  shellHook = ''
+    source .venv/bin/activate
+  '';
+}