Add support container-based plugins

[rcassani]

This PR has as goal to provide an API to manage containers from Brainstorm, and integrate it in GUI

General settings

• Select preferred container engine in options
• Save (set) and read (get) preferred container

Containers API

• Supported engines
  • Docker Desktop
  • Podman Left for future PR
  • Apptainer Left for future PR

Containers as plugins

• Update plugin descriptor to allow container plugins:
  Add fields for image reference and image SHA
• Update plugin menus

%% Container API

• Pull image (Plugin Install)
• Run container as daemon on (Plugin Load)
• Stop daemon container on (Plugin Unload)
• Remove image (Plugin Uninstall)

Documentation

• Containers page in Brainstorm website
  https://neuroimage.usc.edu/brainstorm/Tutorials/Containers
• Add information on Plugin tutorial
  https://neuroimage.usc.edu/brainstorm/Tutorials/Plugins#Container_plugins

Additional info

• Toy example container-based plugin: https://github.com/rcassani/bst-plugin-container
• Related PR: Add DUNEuro 2026 FEM backend and UI #882

[Edouard2laire]

Congrats on the merge !! i am looking forward to test this new functionality:)

[rcassani]

@Edouard2laire, there is a toy example in here:
https://github.com/rcassani/bst-plugin-container