CONTRIBUTING.md Guide Lacking "make" Instruction

As a non-developer wanting to add FTS-5 support to my own build, I followed the instructions in https://github.com/sql-js/sql.js/blob/master/CONTRIBUTING.md and noted that:

• step 6 of the Containerized Development Environment (Recommended) section ("Run $ npm test to ensure all tests pass") fails;
• there is no explicit mention of running make to actually build the distribution assets.

Is there any particular reason why there is no explicit instruction to run make? This would be useful for folk who aren't developers but who may want to make use of a sql.js build with some custom sqlite extensions if there are exact and complete instructions available to do so. (The containerised build really helps in that respect.)

Start with CONTRIBUTING.md, especially step 6 of the Containerized Development Environment section, and run the documented npm test command to reproduce the reported failure. Check how the containerized build produces distribution assets and document the necessary make step and complete instructions for custom SQLite-extension builds; done means the guide is accurate and users can follow it successfully.