build: Add Nix files

flake.nix

@@ -0,0 +1,62 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    systems.url = "github:nix-systems/default";
+    devenv.url = "github:cachix/devenv";
+    nixpkgs-python = {
+      url = "github:cachix/nixpkgs-python";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    devenv,
+    systems,
+    ...
+  } @ inputs: let
+    forEachSystem = nixpkgs.lib.genAttrs (import systems);
+  in {
+    # packages = forEachSystem (system: {
+    #   default =
+    #     nixpkgs.legacyPackages.${system}.poetry2nix.mkPoetryApplication
+    #     {
+    #       projectDir = self;
+    #       preferWheels = true;
+    #     };
+    # });
+
+    devShells =
+      forEachSystem
+      (system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        default = devenv.lib.mkShell {
+          inherit inputs pkgs;
+
+          modules = [
+            {
+              packages = with pkgs; [pre-commit poethepoet stdenv.cc.cc.lib];
+
+              languages.python = {
+                enable = true;
+                # poetry = {
+                #   enable = true;
+                #   install.enable = true;
+                #   install.groups = ["dev" "tests"];
+                #   install.allExtras = true;
+                # };
+                version = "3.11";
+              };
+            }
+          ];
+        };
+      });
+  };
+
+  nixConfig = {
+    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
+    extra-substituters = "https://devenv.cachix.org";
+  };
+}