Fix: update MySQL port mapping to use DB_PORT_FORWARD variable

Docker/QA/docker-compose.yml

@@ -56,7 +56,7 @@ services:
       MYSQL_PASSWORD: ${DB_PASSWORD}
       MYSQL_USER: ${DB_USERNAME}
     ports:
-      - "${DB_PORT}:3306"
+      - "${DB_PORT_FORWARD}:3306"
     volumes:
       - qa_mysql_data:/var/lib/mysql
     networks: