add docker compose

src/app.module.ts

@@ -9,12 +9,12 @@ import { NotificationModule } from './notifications/notification.module';
     ConfigModule.forRoot(),
     TypeOrmModule.forRoot({
       type: 'postgres',
-      host: process.env.POSTGRES_HOST,
-      port: 5432,
-      ssl: process.env.POSTGRES_SSL === 'true',
-      username: process.env.POSTGRES_USER,
-      password: process.env.POSTGRES_PASSWORD,
-      database: process.env.POSTGRES_DATABASE,
+      host: process.env.DB_HOST,
+      port: parseInt(process.env.DB_PORT, 10),
+      ssl: process.env.DB_SSL === 'true',
+      username: process.env.DB_USERNAME,
+      password: process.env.DB_PASSWORD,
+      database: process.env.DB_DATABASE,
       entities: [__dirname + '/**/*.entity{.ts,.js}'],
       synchronize: process.env.DB_SYNC === 'true',
     }),