Support rotating API keys for fork tests

[jpopesculian]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

master 23dc073

What command(s) is the bug in?

cargo test --locked --workspace --all-features --lib --bins

Operating System

Linux

Describe the bug

fork tests seem to be failing on the CI but work locally https://github.com/foundry-rs/foundry/runs/6468348691?check_suite_focus=true

[mattsse]

(code: 429, message: Your app has exceeded its compute units per second capacity. If you have retries enabled, you can safely ignore this message. If not, check out https://docs.alchemyapi.io/guides/rate-limits, data: None)'

got rate-limited by alchemy, let's turn this issue into a feature request to rotate API keys similar to ethers gakonst/ethers-rs#1017

[webthethird]

@mattsse Any chance you could explain how one would use this feature when using forge test?

[mattsse]

this issue was about how we rotate keys internally in foundry not in solidity, but this is implemented via a counter + modulo of the number of keys you have:

like:

let keys = [...];
let mut counter = 0;
fn next_key() {
   let key = keys[counter % keys.len()];
   counter += 1;
   return key;
}

[webthethird]

Got it. I could probably hack together something similar though to use in my forge tests. Thanks!