build: Mysql Docker Image Settings

mysql/Dockerfile

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+# FROM mysql/mysql-server:latest
+FROM mysql:latest
+
+# 권한 문제로 인한 sql 초기세팅 error 해결
+CMD "chmod 755 ./mysql-init-file/init.sql"

mysql/mysql-init-file/init.sql

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+create user 'hangout'@'%' identified with mysql_native_password by 'password';
+grant all privileges on *.* to 'hangout'@'%';
+flush privileges;
+
+CREATE DATABASE hangout DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
+use hangout;