refactor(core): Port external secrets config (no-changelog) (#10094)

packages/@n8n/config/src/configs/external-secrets.ts

@@ -0,0 +1,12 @@
+import { Config, Env } from '../decorators';
+
+@Config
+export class ExternalSecretsConfig {
+	/** How often (in seconds) to check for secret updates */
+	@Env('N8N_EXTERNAL_SECRETS_UPDATE_INTERVAL')
+	readonly updateInterval: number = 300;
+
+	/** Whether to prefer GET over LIST when fetching secrets from Hashicorp Vault */
+	@Env('N8N_EXTERNAL_SECRETS_PREFER_GET')
+	readonly preferGet: boolean = false;
+}