foundryup overwrites foundry-zksync with base foundry

[PatrickAlphaC]

Component

Forge

Describe the feature you would like

When I run foundryup to update my foundry edition, it removes my foundry-zksync installation.

Steps to reproduce:

1. Install foundry-zksync (However you like)
2. Run foundryup
3. Try to do any foundry stuff with zksync, you cannot

Additional context

No response

[dutterbutter]

@PatrickAlphaC

Currently this is intentional as the installation uses the same base directory of .foundryup. If we want to avoid overwriting one another while also ensuring devs can execute the desired binary (between upstream and foundry-zksync) we would need to rename the binaries away from forge and cast. We want to keep the namespace the same, but perhaps we can introduce a forge version manager to switch between the two easily enough.

I will leave this open for now, but this is currently intentional.