fix: mysql service down after startup

mysql/Dockerfile

@@ -15,6 +15,4 @@ COPY my.cnf /etc/mysql/conf.d/my.cnf
 
 RUN chmod 0444 /etc/mysql/conf.d/my.cnf
 
-CMD ["mysqld"]
-
 EXPOSE 3306

mysql/my.cnf

@@ -10,7 +10,3 @@ sql-mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGI
 character-set-server=utf8
 default-authentication-plugin=mysql_native_password
 innodb_use_native_aio=0
-
-[client]
-user=root
-password="root"