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/api/hooks.test.ts

@@ -1,6 +1,5 @@
 import randomstring from "randomstring";
 import { IntegrationService } from "@shared/types";
-import env from "@server/env";
 import { IntegrationAuthentication, SearchQuery } from "@server/models";
 import {
   buildDocument,
@@ -9,6 +8,7 @@ import {
   buildUser,
 } from "@server/test/factories";
 import { getTestServer } from "@server/test/support";
+import env from "../env";
 import * as Slack from "../slack";
 
 jest.mock("../slack", () => ({