chore: add NATS credential support in ssi

apps/ssi-abstraction/src/config/validation.ts

@@ -2,6 +2,8 @@ import Joi from 'joi';
 
 export const validationSchema = Joi.object({
   NATS_URL: Joi.string().required(),
+  NATS_USER: Joi.string().optional(),
+  NATS_PASSWORD: Joi.string().optional(),
   PORT: Joi.number().required(),
 
   AGENT_NAME: Joi.string().required(),