chore: setup mainnet deployment

.env.sample

@@ -0,0 +1,2 @@
+RPC_URL="https://mainnet.infura.io/v3/some-key"
+PRIVATE_KEY="super-secret-key"

README.md

@@ -14,7 +14,19 @@ Test: `npx hardhat test`
 
 ## Deploy with Ignition
 
-`npx hardhat ignition deploy ignition/modules/StakingRewards.ts`
+### Mainnet
+
+First configure the .env file with valid RPC_URL and PRIVATE_KEY values.
+
+Visualize the deployment plan: `npx hardhat ignition visualize ignition/modules/StakingRewards.ts --network mainnet`
+
+Deploy the contract: `npx hardhat ignition deploy ignition/modules/StakingRewards.ts --network mainnet`
+
+### Local
+
+Start the local hardhat node: `npx hardhat node`
+
+Deploy the contract: `npx hardhat ignition deploy ignition/modules/StakingRewards.ts --network localhost`
 
 ### Deployment notes
 

hardhat.config.ts

@@ -1,7 +1,25 @@
 import type { HardhatUserConfig } from 'hardhat/config';
 import '@nomicfoundation/hardhat-toolbox-viem';
+import * as dotenv from 'dotenv';
+
+dotenv.config();
 
 const config: HardhatUserConfig = {
+  networks: {
+    localhost: {
+      url: 'http://127.0.0.1:8545',
+    },
+    // Mainnet configuration (only used if INFURA_API_KEY and PRIVATE_KEY are set)
+    // Let's us still test locally without setting up mainnet
+    ...(process.env.INFURA_API_KEY && process.env.PRIVATE_KEY
+      ? {
+        mainnet: {
+          url: `https://mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
+          accounts: [process.env.PRIVATE_KEY],
+        },
+      }
+      : {}),
+  },
   solidity: {
     compilers: [
       {