[Feature]: Add `SHOPIFY_CLI_WASM_OPT_PATH` environment variable

[eth3lbert]

What area(s) will this request affect?

Running your code locally

What type of change do you want to see?

New feature

Overview

Currently, when you run shopify app build with the cli provided by nixpkgs, you'll most likely encounter a "permission denied" error in the end, as shown below:

╭─ error ──────────────────────────────────────────────────────────────────────╮
│                                                                              │
│  Failed to build function.                                                   │
│                                                                              │
│  EACCES: permission denied, copyfile '/private/var/folders/n0/j42l73_53r72s  │
│  sbwznn235000000gn/T/96c557d287a0fc8e4164efe2462dd947/binary' ->             │
│  '/nix/store/n7hrqlf1a4h421rv76z37adq7g53g7mv-shopify-3.82.1/lib/node_modul  │
│  es/shopify/node_modules/@shopify/cli/bin/wasm-opt.cjs'                      │
│                                                                              │
╰──────────────────────────────────────────────────────────────────────────────╯

This is because it tries to download and copy wasm-opt binary to the nix store.

This can also happen with shopify app dev, but that "permission denied" error is caused by its attempt to copy cloudflared to the nix store.

Motivation

However, since an environment variable, SHOPIFY_CLI_CLOUDFLARED_PATH, exists to help you get around this issue, I think it would be great to also have an environment variable like SHOPIFY_CLI_WASM_OPT_PATH for wasm-opt, similar to how SHOPIFY_CLI_CLOUDFLARED_PATH works for cloudflared.

[isaacroldan]

Thanks for the feedback @eth3lbert, i'll pass this to the functions team