fix: update to use common wasm builder

[mhdawson]

This is the second attempt. Changes from the first version include:

• no longer need to pass --docker when running tools/build-wasm.js so that any existing references (like in the action to update swc will work without needing any changes)
• mapping in a working directory. This is needed when not running as user 1000 (the user specified in the container) as since we are mapping directories into the contoainer the current user is specified and that means that writting to directories in the container won't necessarily work. The current user is often 1000 on single user vms as its the default for the first user but is is not the case otherwise and is not the case when running under actions.

I ran the swc update action here after pushing some additional commits to change the swc version so an update would be done - https://github.com/mhdawson/amaro/actions/runs/11808426410https://github.com/mhdawson/amaro/actions/runs/11808426410

The action ran successfully and created the PR for the swc update.