truffle-config.js

require('dotenv').config();
const { INFURA_API_URL, DEPLOY_KEY_1, DEPLOY_KEY_2, GANACHE_PORT } = process.env;

const HDWalletProvider = require('@truffle/hdwallet-provider');

const private_keys = [  
  DEPLOY_KEY_1,
  DEPLOY_KEY_2,
]


module.exports = { 
  networks: {    
    development: {
     host: "127.0.0.1",     // Localhost (default: none)
     port: GANACHE_PORT,            // Standard Ethereum port (default: none)
     network_id: "*",       // Any network (default: none)
    },
    rinkeby: {
      provider: () => new HDWalletProvider({
        privateKeys: private_keys,
        providerOrUrl: INFURA_API_URL,
        numberOfAddresses: 2
      }),
      network_id: 4,
      gas: 5500000,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    }    
  },

  // Set default mocha options here, use special reporters, etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "0.8.16",      // Fetch exact version from solc-bin (default: truffle's version)
      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
      // settings: {          // See the solidity docs for advice about optimization and evmVersion
      //  optimizer: {
      //    enabled: false,
      //    runs: 200
      //  },
      //  evmVersion: "byzantium"
      // }
    }
  },

  // Truffle DB is currently disabled by default; to enable it, change enabled:
  // false to enabled: true. The default storage location can also be
  // overridden by specifying the adapter settings, as shown in the commented code below.
  //
  // NOTE: It is not possible to migrate your contracts to truffle DB and you should
  // make a backup of your artifacts to a safe location before enabling this feature.
  //
  // After you backed up your artifacts you can utilize db by running migrate as follows:
  // $ truffle migrate --reset --compile-all
  //
  // db: {
  //   enabled: false,
  //   host: "127.0.0.1",
  //   adapter: {
  //     name: "sqlite",
  //     settings: {
  //       directory: ".db"
  //     }
  //   }
  // }
};