document the minimal system setup (in a Ubuntu 24.04 container) for building MIxS derived files

[turbomam]

This repo requires documentation on the technical aspects of creating a new MIxS GitHub release.

Part of that is ensuring that the person doing the release has the appropriate development environment on their computer. Much of that can be configured by running poetry install, but installing Python, poetry and a few other system tools are prerequisites for that.

Documenting it from the standpoint of a minimal Ubuntu Linux computer is easy to test. Most of the directions will be applicable to a MacOS user. Instructions for Windows users not working in an Ubuntu WSL container would be much more difficult.