Custom dependencies in sandbox Docker image

[Samuele458]

Describe your question

I would like to understand what the standard procedure is for making the sandbox have custom dependencies.

In many cases where execution fails it is due to missing programs/dependencies within the sandbox image.

It would therefore be convenient to have the possibility to carry out an initial customization (in my case, it would be convenient to configure a node.js/nvm environment, the agent often fails when trying to install them).

Currently, what would be the most effective/consistent way to carry out this type of customization?