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)

.env.test

@@ -0,0 +1,26 @@
+NODE_ENV=test
+DATABASE_URL=postgres://user:pass@127.0.0.1:5432/outline-test
+SECRET_KEY=F0E5AD933D7F6FD8F4DBB3E038C501C052DC0593C686D21ACB30AE205D2F634B
+
+SMTP_HOST=smtp.example.com
+SMTP_FROM_EMAIL=hello@example.com
+SMTP_REPLY_EMAIL=hello@example.com
+
+GOOGLE_CLIENT_ID=123
+GOOGLE_CLIENT_SECRET=123
+
+SLACK_CLIENT_ID=123
+SLACK_CLIENT_SECRET=123
+
+OIDC_CLIENT_ID=client-id
+OIDC_CLIENT_SECRET=client-secret
+OIDC_AUTH_URI=http://localhost/authorize
+OIDC_TOKEN_URI=http://localhost/token
+OIDC_USERINFO_URI=http://localhost/userinfo
+
+IFRAMELY_API_KEY=123
+
+RATE_LIMITER_ENABLED=false
+
+FILE_STORAGE=local
+FILE_STORAGE_LOCAL_ROOT_DIR=/tmp