add dotenv as an explicit dependency

package.json

@@ -32,6 +32,7 @@
     "@babel/preset-typescript": "^7.15.0",
     "@resolritter/tsc-files": "^1.1.4",
     "@types/node": "^16.10.3",
+    "dotenv": "^16.0.1",
     "nodemon": "^2.0.13",
     "opstooling-js-style": "https://github.com/paritytech/opstooling-js-style#master",
     "rimraf": "^3.0.2",