ros1_bridge cannot be built on CI anymore

[quarkytale]

Foxy is EOL, so there are no actively supported ROS 2 distributions on Focal. This means that we have no distributions where we can build the ros1_bridge in ci.ros2.org anymore.

Possible alternatives could be:

• Setting up CI for build and tests using Github Actions (currently there's a workflow to build in main )
• Using OSRF Docker images in the actions workflow, or a custom script to run
• Using ros-tooling/action-ros-ci (supports multiple distros at the same time)
• Using debian packages for building ROS 1/2

Also, there's an open PR using the rolling docker image #398

[quarkytale]

Using debian packages is the preferred option and to be sought out first as it would be beneficial in the long run.