Env follow up (#231)

* Create the env file only if not empty

* Update

* Check some fs operation to async

package.json

@@ -33,6 +33,7 @@
         "composerize": "~1.4.1",
         "croner": "~7.0.5",
         "dayjs": "~1.11.10",
+        "dotenv": "~16.3.1",
         "express": "~4.18.2",
         "express-static-gzip": "~2.1.7",
         "http-graceful-shutdown": "~3.1.13",