Update ecosystem configuration to change start script for application

- Modified the start script in ecosystem.config.js from "yarn" to "./node_modules/.bin/next" to ensure the application starts correctly using the Next.js framework.

ecosystem.config.js

@@ -2,7 +2,7 @@ module.exports = {
   apps: [
     {
       name: "gami-op",
-      script: "yarn",
+      script: "./node_modules/.bin/next",
       args: "start",
       cwd: "./",
       instances: "max",