chore: DB init 전에 액세스 제거

init/sql/init.sql

 DROP ROLE IF EXISTS wsd;
 CREATE USER wsd WITH PASSWORD 'wsdpass1234';
-GRANT ALL PRIVILEGES ON DATABASE 'meanspec' TO wsd;
 
 CREATE TABLE users (
     id                      SERIAL NOT NULL PRIMARY KEY, /* SERIAL is denoted as INTEGER when referencing */