Unable to pack/publish when out-dir option is used for build

[danielronnkvist]

🐛 Bug description

When running wasm-pack build with the --out-dir option with a value of something else than "pkg" I'm not able to run wasm-pack pack or wasm-pack publish because these commands require the output directory to be the default "pkg".

🤔 Expected Behavior

I should be able to provide an option to the pack and publish commands that will allow me to use them when I've built my package to a different output directory.

👟 Steps to reproduce

wasm-pack build -d web
wasm-pack pack

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.12.1
rustc version: 1.75.0