Bug running against local Anvil RPC

[MCarlomagno]

Description

When I try to prove blocks locally running

# http://127.0.0.1:8546 corresponds to my local anvil node
just ethereum prove --rpc=http://127.0.0.1:8546 --block-number=16

I see an error:

thread 'main' panicked at /Users/marcos/repos/zeth/crates/preflight/src/lib.rs:164:18:
Unsupported chain

line

After inspecting and adding logs to the code, it seems that the error is caused because the chain from the RPC is detected as AnvilHardhat but the chain_spec mapping does not consider this config

    fn chain_spec(chain: &NamedChain) -> Option<Arc<Self::ChainSpec>> {
        match chain {
            NamedChain::Mainnet => Some(MAINNET.clone()),
            NamedChain::Sepolia => Some(SEPOLIA.clone()),
            NamedChain::Holesky => Some(HOLESKY.clone()),
            NamedChain::Dev => Some(DEV.clone()),
            // Missing AnvilHardhat here
            _ => None,
        }
    }

[linear]

ZETH-37 Bug running against local Anvil RPC