cbackup.deb mysql-server Pre-dependency when trying to using Mariadb

[EclipseKnight]

It is not possible to install cbackup because it has mysql-server as a pre-dependency despite mariadb (which is installed and configured) being stated as "compatible" on the site. I've already attempted MySQL several times v8 and v5.7(which is a pain to actually get installed and working on ubuntu 20.04).

If there is a workaround then outlining it in the installation documentation would be a good idea.

[EclipseKnight]

After removing the Pre-dependency from the .deb and installing it, the server threw an Error during the setup. Same error I had when using MySQL v8. PHP v7.4
Mariadb v10.3

To clarify, this is a fresh ubuntu 20.04 VM with no other previous databases installed.

[EclipseKnight]

Looking further in the log Spring startup is failing with:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scheduler': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'cbackup.scheme' in value "${cbackup.scheme}"