Bug 31059 - encryption_key config entry not generated when upgrading: solution

Problem statement

The following line does not add to koha-conf.xml when upgrading. I noticed it happened when we upgraded to the Koha version to 22.11.7 and higher. It results in the upgrade process terminating on the way, and Koha crashes.

 <!-- Encryption key for crypted password or sensitive data -->
 <encryption_key>__ENCRYPTION_KEY__</encryption_key>