easy-to-install Minetest Gymnasium interface

[garymm]

Currently you have to check out the minetest repo and build from source to use the gymnasium interface. Some ideas for how to make this easier:

• Publish a conda package that contains the minetest binary and the gymansium environment python code. It executes the binary it as a subprocess. So far I'm leaning towards this.
• Have a python library that starts minetest on demand, possibly:
  • download the binary from somewhere and executes it as a subprocess
  • fetch a docker image and runs it
  • start a pod or service on kubernetes