chore: ecosystem 추가

ecosystem.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  apps: [
+    {
+      name: 'qcast-front-production',
+      script: 'npm run start',
+      instance: 2,
+      exec_mode: 'cluster',
+    },
+  ],
+}

package.json

@@ -5,7 +5,8 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "start": "next start -p 5000",
+    "start:cluster1": "next start -p 5000",
+    "start:cluster2": "next start -p 5001",
     "start:dev": "next start -p 5010",
     "lint": "next lint",
     "serve": "node server.js"