Steps to reproduce the issue

Use staging image as basis to install a new Joomla site. Proceed with installation as normal.

Expected result

Successful installation of Joomla.

Actual result

Returns to step 2 with the message: Error: Index column size too large. The maximum column size is 767 bytes.

System information (as much as possible)

MySQL server 5.5-5.7 with innodb_large_prefix and innodb_file_format set to their respective default value (non-default values will result in the index keys to be silently truncated)

Additional comments

https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_large_prefix for details.