Add support for ROS-O (ROS One) distribution

[iory]

Summary

This PR adds support for ROS-O (ROS One), a community-supported ROS 1 distribution that works on Ubuntu 20.04 and newer versions.

Changes

Core functionality

• Add ROS-O repository configuration with GPG key handling
• Support mixed ROS 1 and ROS 2 repository installation on the same system
• Implement proper repository selection based on Ubuntu version and requested distributions

Bug fixes

• Fix SSL certificate handling when downloading ROS-O GPG key by ensuring ca-certificates is installed
• Pin meson version (>=0.60.0,<0.64.0) to avoid colcon-meson 0.4.2 compatibility issues with newer meson releases

Testing

• Add ROS-O test cases to CI workflow
• Test matrix includes: ubuntu:jammy with ROS-O, ubuntu:noble with ROS-O

Use cases

This enables several useful combinations:

• Install ROS-O alongside ROS 2 Humble on Ubuntu 22.04
• Install ROS-O alongside ROS 2 Jazzy on Ubuntu 24.04
• Install Noetic + Rolling on Ubuntu 20.04 (both ROS 1 and ROS 2 repos)

Example usage:

- uses: ros-tooling/setup-ros@ros-o-support
  with:
    required-ros-distributions: one humble

Technical details

The implementation handles backward compatibility by:

• Always adding ROS 1 repository on Focal (Ubuntu 20.04) for focal-specific dependencies
• Adding ROS 2 repository on newer Ubuntu versions when no distributions are specified
• Adding both repositories when mixed distributions are requested

Testing

All CI tests pass with these changes. The implementation has been tested with:

• ROS-O + Humble on Ubuntu 22.04
• ROS-O + Jazzy on Ubuntu 24.04
• Noetic + Rolling on Ubuntu 20.04

Breaking changes

None. This is fully backward compatible with existing configurations.