fix: switch between empty/forked chain without the need to recreate the entire image (#2795)

.changeset/old-carpets-worry.md

+---
+'@eth-optimism/hardhat-node': minor
+---
+
+Correct configuration file behavior

ops/docker/hardhat/hardhat.config.js

+require('dotenv').config()
+
 const isForkModeEnabled = !!process.env.FORK_URL
 const forkUrl = process.env.FORK_URL
 const forkStartingBlock =

ops/docker/hardhat/package.json

@@ -6,6 +6,7 @@
   },
   "license": "MIT",
   "dependencies": {
+    "dotenv": "^10.0.0",
     "hardhat": "^2.9.6"
   }
 }