For building a multi-architecture charm, it is common to use `matrix.runs-on` to build multi-architecture charm in parallel. However, the cache mechanism in `craft-action/pack` does not this into account when creating the [cache key](https://github.com/canonical/craft-actions/blob/main/charmcraft/pack/action.yaml#L58), so the cache may be overridden or collided. I would like to request a support for this, thanks!