chore: handle the wp-config in entrypoint

Dockerfile

@@ -181,7 +181,7 @@ RUN chmod -R g+rwx /var/www/html/
 # Copy the Nginx configuration file into the container at /etc/nginx/nginx.conf
 COPY nginx.conf /etc/nginx/nginx.conf
 # Add wordpress config and database env
-COPY --chown=www-data:www-data wp-config.php /var/www/html/wp-config.php
+COPY --chown=www-data:www-data wp-config.php /usr/src/wordpress/wp-config.php
 ENV WORDPRESS_DB_USER=root
 ENV WORDPRESS_DB_NAME=test_db
 # Add wordpress entrypoint