feat: add getting started wallet script

Adds a script to contracts-bedrock that generates the four wallets
required for the getting started guide.

.envrc.example

@@ -2,14 +2,19 @@
 #                 Getting Started                #
 ##################################################
 
-# Addresses and private keys for the four accounts generated in the Getting
-# Started quickstart guide.
+# Admin account
 export GS_ADMIN_ADDRESS=
 export GS_ADMIN_PRIVATE_KEY=
+
+# Batcher account
 export GS_BATCHER_ADDRESS=
 export GS_BATCHER_PRIVATE_KEY=
+
+# Proposer account
 export GS_PROPOSER_ADDRESS=
 export GS_PROPOSER_PRIVATE_KEY=
+
+# Sequencer account
 export GS_SEQUENCER_ADDRESS=
 export GS_SEQUENCER_PRIVATE_KEY=
 

packages/contracts-bedrock/scripts/getting-started-wallets.sh

+#!/usr/bin/env bash
+
+# This script is used to generate the four wallets that are used in the Getting
+# Started quickstart guide on the docs site. Simplifies things for users
+# slightly while also avoiding the need for users to manually copy/paste a
+# bunch of stuff over to the environment file.
+
+# Generate wallets
+wallet1=$(cast wallet new)
+wallet2=$(cast wallet new)
+wallet3=$(cast wallet new)
+wallet4=$(cast wallet new)
+
+# Grab wallet addresses
+address1=$(echo "$wallet1" | awk '/Address/ { print $2 }')
+address2=$(echo "$wallet2" | awk '/Address/ { print $2 }')
+address3=$(echo "$wallet3" | awk '/Address/ { print $2 }')
+address4=$(echo "$wallet4" | awk '/Address/ { print $2 }')
+
+# Grab wallet private keys
+key1=$(echo "$wallet1" | awk '/Private key/ { print $3 }')
+key2=$(echo "$wallet2" | awk '/Private key/ { print $3 }')
+key3=$(echo "$wallet3" | awk '/Private key/ { print $3 }')
+key4=$(echo "$wallet4" | awk '/Private key/ { print $3 }')
+
+# Print out the environment variables to copy
+echo "Copy the following into your .envrc file:"
+echo
+echo "# Admin account"
+echo "export GS_ADMIN_ADDRESS=$address1"
+echo "export GS_ADMIN_PRIVATE_KEY=$key1"
+echo
+echo "# Batcher account"
+echo "export GS_BATCHER_ADDRESS=$address2"
+echo "export GS_BATCHER_PRIVATE_KEY=$key2"
+echo
+echo "# Proposer account"
+echo "export GS_PROPOSER_ADDRESS=$address3"
+echo "export GS_PROPOSER_PRIVATE_KEY=$key3"
+echo
+echo "# Sequencer account"
+echo "export GS_SEQUENCER_ADDRESS=$address4"
+echo "export GS_SEQUENCER_PRIVATE_KEY=$key4"