#12 Build server for ros2

[AlexBarbi]

Add CI build workflow for ROS 2 Jazzy

Updates GitHub Actions workflow (.github/workflows/ros-build-test.yaml) that builds and tests legged_control on Ubuntu 24.04 with ROS 2 Jazzy.

What it does

• Runs on push and pull requests targeting ros2-jazzy-devel.
• Installs system dependencies, ROS 2 Jazzy, and Pinocchio (from robotpkg).
• Checks out source dependencies (ocs2, ocs2_robotic_assets) and the package.
• Resolves dependencies with rosdep and builds in Debug mode with colcon.

Notes

• This PR validates the CI recipe itself; the build targets code on ros2-jazzy-devel.

This is a test