Create repository to run benchmarks in a self-hosted github runner

[carlossvg]

In order to automate ROS 2 real-time benchmarks it would be interesting to create a repository specifically to show how to create a CI with a self-hosted github runner using a RPI4.

Related:

• https://github.com/ros-controls/ros2_control/issues/118
• https://github.com/olivier-stasse/ros2_control/blob/master/.github/workflows/rt_test.yml

Acceptance criteria

• [ ] A new repository exists containing some jobs and instructions to use a self hosted runner

[vmayoral]

Kudos to this!