ensure npm run build is in production mode (#5934)
ensure npm run build is in production mode (#5934)


zhouyao1994/incubator-superset,apache/incubator-superset,mistercrunch/panoramix,mistercrunch/panoramix,airbnb/superset,mistercrunch/panoramix,airbnb/caravel,apache/incubator-superset,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/caravel,airbnb/superset,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,apache/incubator-superset,airbnb/superset