Fatal error: Allowed memory size of 2097152 bytes exhausted (

Hello,
I have me too upgraded Nextcloud 21 installing on Docker.
Can you help me please, i have same problem Allowed memory…when i execute OCC commands
when i write this command line :
@NAS01:~# docker exec nextcloud_nextcloud_1 su - www-data -s /bin/bash -c ‘php -d memory_limit=-1 -f /var/www/html/cron.php’ ----No error but it no works because i have
always message: Allowed memory…
And so i tried this command line:
@NAS01:~# docker exec nextcloud_nextcloud_1 su - www-data -s /bin/bash -c ‘PHP_MEMORY_LIMIT=512M php -f /var/www/html/cron.php’
Return : php: $’\342\200\230PHP_MEMORY_LIMIT=512M’: command not found
Please, this command do you set in crontab file ? where is the file ? the parameter set ?
Regards,