feat(nix): add nix flake

flake.nix

@@ -0,0 +1,148 @@
+{
+  inputs = {
+    nix-ros-overlay.url = "github:lopsided98/nix-ros-overlay/master";
+    nixpkgs.follows = "nix-ros-overlay/nixpkgs";
+  };
+  outputs = { self, nix-ros-overlay, nixpkgs }:
+    nix-ros-overlay.inputs.flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            nix-ros-overlay.overlays.default
+          ];
+        };
+
+
+
+        python-vcs = pkgs.python3Packages.buildPythonPackage rec {
+            pname = "python-vcs2l";
+            version = "1.1.7";
+            pyproject = true;
+
+            src = pkgs.python3Packages.fetchPypi {
+                inherit version;
+                pname = "vcs2l";
+                hash = "sha256-HYbmhfngHdonG4nfGyvULKVVX1wNy+9cxyfUQ/JXOM0=";
+            };
+
+            build-system = [ pkgs.python3Packages.setuptools ];
+            dependencies = [ pkgs.python313Packages.pyyaml ];
+        };
+
+        python-rosdistro = pkgs.python3Packages.buildPythonPackage rec {
+            pname = "python-rosdistro";
+            version = "1.0.1";
+            pyproject = true;
+
+            src = pkgs.python3Packages.fetchPypi {
+                inherit version;
+                pname = "rosdistro";
+                hash = "sha256-J/iLS/CteekF6R2zdnS586JdEnrm5HuqvR4YBE1gwmw=";
+            };
+
+            build-system = [ pkgs.python3Packages.setuptools ];
+            dependencies = [ pkgs.python313Packages.pyyaml
+                             pkgs.python313Packages.catkin-pkg
+                             pkgs.python313Packages.rospkg
+            ];
+        };
+
+
+        python-rosdep = pkgs.python3Packages.buildPythonPackage rec {
+            pname = "python-rosdep";
+            version = "0.26.0";
+            pyproject = true;
+
+            src = pkgs.python3Packages.fetchPypi {
+                inherit version;
+                pname = "rosdep";
+                hash = "sha256-xHQwAwWLwO7Udgf0Zh9dGnxQWKgwuMs6BAPu+gndba0=";
+            };
+
+            build-system = [ pkgs.python3Packages.setuptools ];
+            dependencies = [ pkgs.python313Packages.pyyaml
+                             pkgs.python313Packages.distutils
+                             pkgs.python313Packages.catkin-pkg
+                             pkgs.python313Packages.rospkg
+                             python-rosdistro
+            ];
+        };
+
+      in
+    {
+        devShells.default = pkgs.mkShell {
+          name = "Lucy ROS dev shell";
+
+          packages = [
+            python-vcs
+            python-rosdep
+
+            pkgs.llvmPackages_20.clang-tools
+            pkgs.python313Packages.black
+
+            pkgs.colcon
+            pkgs.cmake
+            pkgs.spdlog
+            pkgs.fmt
+            pkgs.doxygen
+
+            (with pkgs.rosPackages.jazzy; buildEnv {
+              paths = [
+                desktop
+                xacro
+                ros-gz-bridge
+
+                rqt
+                rqt-common-plugins
+
+                # Simulation
+                image-transport
+                compressed-image-transport
+                ros-gz-sim
+                gz-sim-vendor
+                gz-cmake-vendor
+                gz-ros2-control
+
+                ros-gz-interfaces
+                simulation-interfaces
+
+                ros2-control
+                controller-manager
+                ros2-controllers
+                hardware-interface
+
+                micro-ros-msgs
+                fastcdr
+                realsense2-camera
+                rosbridge-server
+
+                joint-trajectory-controller
+                joint-state-broadcaster
+                joint-state-publisher
+                joint-state-publisher-gui
+
+                python-cmake-module
+
+                ament-cmake
+                ament-cmake-core
+                ament-cmake-python
+              ];
+            })
+          ];
+
+          shellHook = ''
+            echo -e ""
+            echo -e "🛡️  \033[1;36mLucy Development Environment\033[1;0m"
+            echo -e "----------------------------"
+            echo -e "ROS2: $ROS_DISTRO"
+            echo -e "Système: ${system}"
+            echo -e "----------------------------"
+          '';
+        };
+      });
+  nixConfig = {
+    extra-substituters = [ "https://ros.cachix.org" ];
+    extra-trusted-public-keys = [ "ros.cachix.org-1:dSyZxI8geDCJrwgvCOHDoAfOm5sV1wCPjBkKL+38Rvo=" ];
+  };
+}