🛤️ Tracking: Test Hipcheck's support for Containerized plugins

[j-lanson]

So far, we have designed the Hipcheck plugin interface / startup code to theoretically support containerized plugins, but we have not actually tested that support.

Such a plugin would have an entrypoint like podman <CONTAINER_IMAGE_FILE>, plus any additional arguments necessary, and Hipcheck will append --port <PORT>.

• Develop a containerized version of an existing plugin
• Test containerized plugin
  (Package it with a plugins.kdl and install it in the local cache, try running it)
• Add documentation to site on how to build / package containerized plugins