Feature Request: Print output of the build command

[hasparus]

Howdy 👋 Firstly, thanks for this amazing action.

I wanted to post a feature request. It would be nice to be able to pass silent: false to the exec options here:

https://github.com/pkg-size/action/blob/7cbd5229062f24aec6543e0b8fd5eb09233bf355/src/lib/build-ref.js#L55

To be able to see the full output of the buildCommand that could help with debugging or prove informative in other ways.

I already changed it in my fork, and it's working pretty nicely. Let me know what you think 🙏 If you accept contributions, I can shoot you a quick PR for this.