Fix chown command to use colon for user and group separation

Author: Everhard

Dockerfile

@@ -43,7 +43,7 @@ COPY config/php.ini ${PHP_INI_DIR}/conf.d/custom.ini
 COPY config/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Make sure files/folders needed by the processes are accessable when they run under the nobody user
-RUN chown -R nobody.nobody /var/www/html /run /var/lib/nginx /var/log/nginx
+RUN chown -R nobody:nobody /var/www/html /run /var/lib/nginx /var/log/nginx
 
 # Switch to use a non-root user from here on
 USER nobody