Change occ to generate

nextcloud/image/Dockerfile

@@ -9,7 +9,7 @@ COPY supervisord.conf /
 
 ENV NEXTCLOUD_UPDATE=1
 
-RUN echo '*/15 * * * * php /var/www/html/occ preview:generate-all' >> /var/spool/cron/crontabs/www-data
+RUN echo '*/15 * * * * php /var/www/html/occ preview:generate' >> /var/spool/cron/crontabs/www-data
 RUN echo '0 2 * * 0 php /var/www/html/occ recognize:recrawl' >> /var/spool/cron/crontabs/www-data
 RUN echo '1 2 * * 0 php /var/www/html/occ recognize:cleanup-tags' >> /var/spool/cron/crontabs/www-data