docker mysql 没有 root 用户

docker mysql 没有 root 用户，需要创建 root

1. flush privileges; 解决 ERROR 1290 (HY000): The MySQL server is running with the –skip-grant-tables option so it cannot execute 这个问题
2. CREATE USER ‘root’@’%’ IDENTIFIED WITH mysql_native_password BY ‘123’;
3. GRANT ALL PRIVILEGES ON *.* TO ‘root’@’%’ WITH GRANT OPTION;
4. flush privileges;