More automation and a Docker image

[ErcModel3]

Started as trying to bulid a poc with python but there were too many issues, instead did the following:

• Changed the topology from 2 switches to 4 becuase the eventual testing would need more than just a 2x2 matrix
• Updated documentation based on the topology change
• In testing found the ubuntu:24.04 image doesn't have ssh enabled by default so I wrote a new dockerfile for the probe (as it can't be configured without manually attaching a shell and doing it)
• Wrote a github action (untested) to build and push new docker images to the docker hub so we're all working on the same one (haven't changed the clab topology yet as it hasn't been tested)

[ErcModel3]

Did some testing and can confirm the following:

• The probe images can now be seen on the docker hub under my account (repo that holds them is private)
• The action that builds the docker images actually work
• Referencing the new probe image in the clab file works and you can log into the container with admin/admin (will change at a later date)

[schweet42]

cool