Separate environment configs (#6597)

* Separate environment configs

* wip

* wip

* test

* plugins

* test

* test

* .sequelizerc, unfortunately can't go through /utils/environment due to not supporting TS

* docker-compose -> docker compose

* fix: .local wipes .development

* Add custom validation message for invalid SECRET_KEY (often confused)

plugins/slack/server/slack.ts

@@ -1,7 +1,7 @@
 import querystring from "querystring";
-import env from "@server/env";
 import { InvalidRequestError } from "@server/errors";
 import fetch from "@server/utils/fetch";
+import env from "./env";
 
 const SLACK_API_URL = "https://slack.com/api";