Support Docker Workspace Root Dir

[rauljordan]

Description

When running a project example that has a relative dependency to a workspace, such as the erc20 below, cargo stylus deploy will fail as the Docker container does not include the absolute workspace directory to look up the dependencies.

[package]
name = "erc20"
version = "0.1.0"
edition = "2021"

[dependencies]
alloy-primitives = "=0.8.13"
alloy-sol-types = "=0.8.13"
stylus-sdk = { path = "../../stylus-sdk" }
mini-alloc = { path = "../../mini-alloc" }

This PR attempts to fix the issue by allowing the user to specify the workspace directory to Docker. However, this is running into issues where we don't really support workspace directories in cargo stylus. As such, will mark as a draft until we have a longer-term solution here.