fix(front): 修复打包构建进程不退出的问题(closed TencentBlueKing#317)

# Reviewed, transaction id: 7946

web/build/build.js

@@ -44,5 +44,6 @@ rm(config.build.assetsRoot, e => {
             '  Tip: built files are meant to be served over an HTTP server.\n'
             + '  Opening index.html over file:// won\'t work.\n'
         ))
+        process.exit(0)
     })
 })