feat(docker): Docker build with multi-stage

This will significantly reduce the size of the final image used for deployment.

next.config.js

@@ -16,6 +16,7 @@ const nextConfig = {
     // https://nextjs.org/docs/api-reference/next.config.js/ignoring-typescript-errors
     ignoreBuildErrors: true,
   },
+  output: 'standalone',
 }
 
 module.exports = nextConfig