feat: Verify contracts on etherscan

--- don't change below this line ---
ENG-4260 Took 31 minutes

foundry/scripts/README.md

@@ -5,7 +5,7 @@
 
 ## Deploy on a Tenderly fork
 
-1. Make a new [fork](https://dashboard.tenderly.co/) in tenderly dashboard for the 
+1. Make a new [fork](https://dashboard.tenderly.co/) in tenderly dashboard for the
    chain that you wish to deploy on.
 2. Set the following environment variables:
 
@@ -25,6 +25,7 @@ export PRIVATE_KEY=<private-key>
 export RPC_URL=<chain-rpc-url>
 export DEPLOY_WALLET=<wallet-address>
 export PRIVATE_KEY=<private-key>
+export ETHERSCAN_API_KEY=<etherscan-api-key>
 ```
 
 Make sure to run `unset HISTFILE` in your terminal before setting the private key. This will prevent the private key