feat(ctp): support deploy from PK (#3256)

Makes it possible to easily deploy via PK if not deploying via Ledger.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.changeset/curvy-pillows-boil.md

+---
+'@eth-optimism/contracts-periphery': patch
+---
+
+Support deploy via Ledger or private key

packages/contracts-periphery/.env.example

@@ -4,8 +4,11 @@ ETHEREUM_ETHERSCAN_API_KEY=
 # Etherscan API key for Optimism and Optimism testnets
 OPTIMISTIC_ETHERSCAN_API_KEY=
 
-# Ledger required to deploy stuff, insert address here
+# Insert your Ledger address here if using a Ledger to deploy
 LEDGER_ADDRESS=
 
+# Alternatively you can use a private key, but leave Ledger blank if so
+PRIVATE_KEY=
+
 # Required to deploy to Ethereum or Ethereum testnets
 INFURA_PROJECT_ID=

packages/contracts-periphery/hardhat.config.ts

+import assert from 'assert'
+
 import { HardhatUserConfig, subtask } from 'hardhat/config'
 import { TASK_COMPILE_SOLIDITY_GET_SOURCE_PATHS } from 'hardhat/builtin-tasks/task-names'
 import { getenv } from '@eth-optimism/core-utils'
@@ -29,11 +31,21 @@ subtask(TASK_COMPILE_SOLIDITY_GET_SOURCE_PATHS).setAction(
   }
 )
 
+assert(
+  !(getenv('PRIVATE_KEY') && getenv('LEDGER_ADDRESS')),
+  'use only one of PRIVATE_KEY or LEDGER_ADDRESS'
+)
+
+const accounts = getenv('PRIVATE_KEY')
+  ? [getenv('PRIVATE_KEY')]
+  : (undefined as any)
+
 const config: HardhatUserConfig = {
   networks: {
     optimism: {
       chainId: 10,
       url: 'https://mainnet.optimism.io',
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('OPTIMISTIC_ETHERSCAN_API_KEY'),
@@ -43,6 +55,7 @@ const config: HardhatUserConfig = {
     'optimism-kovan': {
       chainId: 69,
       url: 'https://kovan.optimism.io',
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('OPTIMISTIC_ETHERSCAN_API_KEY'),
@@ -52,6 +65,7 @@ const config: HardhatUserConfig = {
     'optimism-goerli': {
       chainId: 420,
       url: 'https://goerli.optimism.io',
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('OPTIMISTIC_ETHERSCAN_API_KEY'),
@@ -61,6 +75,7 @@ const config: HardhatUserConfig = {
     ethereum: {
       chainId: 1,
       url: `https://mainnet.infura.io/v3/${getenv('INFURA_PROJECT_ID')}`,
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('ETHEREUM_ETHERSCAN_API_KEY'),
@@ -70,6 +85,7 @@ const config: HardhatUserConfig = {
     goerli: {
       chainId: 5,
       url: `https://goerli.infura.io/v3/${getenv('INFURA_PROJECT_ID')}`,
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('ETHEREUM_ETHERSCAN_API_KEY'),
@@ -79,6 +95,7 @@ const config: HardhatUserConfig = {
     ropsten: {
       chainId: 3,
       url: `https://ropsten.infura.io/v3/${getenv('INFURA_PROJECT_ID')}`,
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('ETHEREUM_ETHERSCAN_API_KEY'),
@@ -88,6 +105,7 @@ const config: HardhatUserConfig = {
     kovan: {
       chainId: 42,
       url: `https://kovan.infura.io/v3/${getenv('INFURA_PROJECT_ID')}`,
+      accounts,
       verify: {
         etherscan: {
           apiKey: getenv('ETHEREUM_ETHERSCAN_API_KEY'),
@@ -128,7 +146,9 @@ const config: HardhatUserConfig = {
   },
   namedAccounts: {
     deployer: {
-      default: `ledger://${getenv('LEDGER_ADDRESS')}`,
+      default: getenv('LEDGER_ADDRESS')
+        ? `ledger://${getenv('LEDGER_ADDRESS')}`
+        : 0,
       hardhat: 0,
     },
   },