deploy: Add PM2 config file.

Author: sustained

ecosystem.config.js

@@ -0,0 +1,22 @@
+module.exports = {
+  apps: [
+    {
+      name: 'bot',
+      script: 'npm run serve',
+      instances: 1,
+      autorestart: true,
+      watch: false,
+      max_restarts: 10,
+      restart_delay: 5000,
+      max_memory_restart: '200M',
+      env: {
+        NODE_ENV: 'development',
+      },
+      env_production: {
+        NODE_ENV: 'production',
+      },
+      error_file: 'logs/err.log',
+      out_file: 'logs/out.log',
+    },
+  ],
+}