Add CI action to build WASM

[thegecko]

This PR should add a GitHub action which builds the llvm WASM file (about 2 hours).

If triggered using a tag, a package should also be published onto the GitHub npm registry with emscripten types to allow the WASM file to be imported by another project e.g.:

import LlvmBoxModule from '@jprendes/emception';
...
async #init(LlvmBoxModule, FS, opts) {
...

This was developed to separate our usage of llvm-box from a consuming project. Feel free to use it as inspiration if something else is required in this project

[jprendes]

Thanks for the PR! This is not using npmjs.com's registry but rather github's npm registry, right?

[jprendes]

I think the CI problem is with -it in docker run. Changing it to -i should fix the failure.

[thegecko]

This is not using npmjs.com's registry but rather github's npm registry, right?

that's right

I think the CI problem is with -it in docker run. Changing it to -i should fix the failure.

thanks, forgot to change that

[jprendes]

LGTM

[thegecko]

Although the action succeeded, it failed to find the output files, does this look right?

        ./build/llvm/bin/llvm-box.wasm
        ./build/llvm/bin/llvm-box.mjs

[jprendes]

Nop, that doesn't look correct. Do you have bandwidth to take a look?

[thegecko]

Ok, could you tell me where the output llvm wasm and mjs files end up? I don't have a set up I can look at

[jprendes]

hm, I just checked, and the two files should be there: ./build/llvm/bin/llvm-box.{wasm,mjs}

[thegecko]

OK, I'll build locally and see whats going on