Guide for compiling custom chips to .wasm

[urish]

We often get questions from users how to compile their custom chips for use in VS Code or the Wokwi CLI.

We do have a paragraph about how to configure them in wokwi.toml: https://docs.wokwi.com/vscode/project-config#custom-chips

But we need a guide that explains how to compile them with Docker or using a GitHub Action, like we do in inverter-chip. There are some good pointers on how to compile locally on Discord (people have previously asked this question).