conf: 编译时间，加点浮动

build.js

@@ -1,5 +1,5 @@
 const { execSync } = require('child_process');
 
-process.env.REACT_APP_BUILD_TIME = new Date().getTime();
+process.env.REACT_APP_BUILD_TIME = new Date().getTime()+(5*60*1000);
 
 execSync('npm run build', { stdio: 'inherit' });