If you list the directories under
/opt/bitnami/php/include/php you should see the following:
ext include main sapi TSRM Zend
Are those folders present in your deployment? If you executed the
find command but nothing showed up, it is possible that you don't have
Zend there. Could you confirm it?
Which version of Moodle are you using? You can check it in the
/opt/bitnami/properties.ini file. You will see something like this: