Update demo hardhat configs to use env variable for eth endpoint (#277)

* Use an env variable for eth RPC endpoint in hardhat config

* Add a task to get main account address in erc20 watcher

packages/erc20-watcher/hardhat.config.ts

@@ -9,6 +9,7 @@ import './test/tasks/token-transfer';
 import './test/tasks/token-approve';
 import './test/tasks/token-transfer-from';
 import './test/tasks/block-latest';
+import './test/tasks/account';
 
 // You need to export an object to set up your config
 // Go to https://hardhat.org/config/ to learn more
@@ -20,7 +21,7 @@ export default {
   solidity: '0.8.0',
   networks: {
     docker: {
-      url: 'http://geth:8545'
+      url: process.env.ETH_RPC_URL
     }
   },
   paths: {

packages/erc20-watcher/package.json

@@ -25,6 +25,8 @@
     "token:transfer-from:docker": "hardhat --network docker token-transfer-from",
     "block:latest": "hardhat --network localhost block-latest",
     "block:latest:docker": "hardhat --network docker block-latest",
+    "account": "hardhat --network localhost account",
+    "account:docker": "hardhat --network docker account",
     "reset": "DEBUG=vulcanize:* node --enable-source-maps dist/cli/reset.js",
     "reset:dev": "DEBUG=vulcanize:* ts-node src/cli/reset.ts"
   },

packages/erc20-watcher/test/tasks/account.ts

@@ -0,0 +1,12 @@
+//
+// Copyright 2022 Vulcanize, Inc.
+//
+
+import { task } from 'hardhat/config';
+import '@nomiclabs/hardhat-ethers';
+
+task('account', 'Prints the account', async (taskArgs, hre) => {
+  const [account] = await hre.ethers.getSigners();
+
+  console.log(account.address);
+});

packages/erc721-watcher/hardhat.config.ts

@@ -20,7 +20,7 @@ export default {
   solidity: '0.8.0',
   networks: {
     docker: {
-      url: 'http://geth:8545'
+      url: process.env.ETH_RPC_URL
     }
   },
   paths: {

packages/erc721-watcher/package.json

@@ -32,7 +32,8 @@
     "nft:transfer:docker": "hardhat --network docker nft-transfer",
     "block:latest": "hardhat --network localhost block-latest",
     "block:latest:docker": "hardhat --network docker block-latest",
-    "account": "hardhat --network localhost account"
+    "account": "hardhat --network localhost account",
+    "account:docker": "hardhat --network docker account"
   },
   "repository": {
     "type": "git",