If you already have a GitHub account, it is a simple way to help out with a one time or monthly donation. You don’t even have to deal with Liberapay, or PayPal. I know I dropped my PayPal account when they decided that they could fine users for wrong think.
Sponsor @OpenMandrivaAssociation on GitHub Sponsors · GitHub
If you do it, you even get shown on the front page
OpenMandriva Association · GitHub
Of course, if you want to go the Liberapay route, that option is available as well.
https://liberapay.com/OpenMandriva/donate