Automate Deletion of Old Reports - Docker Installation

Hi, I have a docker installation of greenbone community edition that has been running for a year now and we’ve built up a lot of reports. The server that is running greenbone is running out of space and so I was wondering if I deleted some of these reports it would help. Does anyone have any recommendations on how I achieve this without having to delete them all manually?

I’ve seen in old posts that it might be possible through GMP, but I’ve been unsuccessful in installing/enabling this into a docker installation.

Thanks.