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/oidc/plugin.json

@@ -1,12 +1,5 @@
 {
   "name": "OIDC",
   "description": "Adds an OpenID compatible authentication provider.",
-  "requiredEnvVars": [
-    "OIDC_CLIENT_ID",
-    "OIDC_CLIENT_SECRET",
-    "OIDC_AUTH_URI",
-    "OIDC_TOKEN_URI",
-    "OIDC_USERINFO_URI",
-    "OIDC_DISPLAY_NAME"
-  ]
+  "requiredEnvVars": ["OIDC_CLIENT_ID", "OIDC_CLIENT_SECRET", "OIDC_AUTH_URI", "OIDC_TOKEN_URI", "OIDC_USERINFO_URI"]
 }