added to nginx docker - www-data is now part of nginx group, and tmp folder allow nginx group to read and execute

srcs/requirements/nginx/Dockerfile

@@ -16,7 +16,9 @@ RUN mkdir -p /var/log/nginx/
 
 # create user www-data and assign it to group www-data
 RUN adduser -S www-data && \
-	adduser www-data www-data
+	adduser www-data www-data && \
+	adduser www-data nginx && \
+	chmod +rwx /var/lib/nginx/tmp
 
 ARG WP_URL
 ARG MAX_UPLOAD_SIZE