message: typescript app: add JSON_RPC_URL config option
diff: // SPDX-License-Identifier: Apache-2.0
  import { ethers } from "ethers";
  import netEmissionsTokenNetworkAbi from "./NetEmissionsTokenNetwork.json";
  -import { WALLET_PRIVATE_KEY, CONTRACT_ADDRESS, INFURA_PROJECT_ID, INFURA_PROJECT_SECRET } from "../../config/networkConfig";
  +import {
  + WALLET_PRIVATE_KEY,
  + CONTRACT_ADDRESS,
  + INFURA_PROJECT_ID,
  + INFURA_PROJECT_SECRET,
  + JSON_RPC_URL
  +} from "../../config/networkConfig";
  const tokenTypeId = 3;
  const walletPrivateKey = WALLET_PRIVATE_KEY || process.env.WALLET_PRIVATE_KEY;
  const contractAddress = CONTRACT_ADDRESS || process.env.CONTRACT_ADDRESS;
  +const jsonRpcUrl = JSON_RPC_URL || process.env.JSON_RPC_URL || "https://rpc.xdaichain.com/";
  // const infuraProjectId = INFURA_PROJECT_ID || process.env.INFURA_PROJECT_ID;
  // const infuraProjectSecret = INFURA_PROJECT_SECRET || process.env.INFURA_PROJECT_SECRET;
  @@ -17,9 +24,7 @@ function getProvider() {
  // });
  // xDai
  - let provider = new ethers.providers.JsonRpcProvider(
  - "https://rpc.xdaichain.com/"
  - );
  + let provider = new ethers.providers.JsonRpcProvider(jsonRpcUrl);
  return provider;
  }
  