The Raspeberry Pi hardware isn't server hardware, and questions about the hardware are off-topic for Server Fault, full stop.

Questions about server software running on the "Pi" would seem to be on-topic, assuming that the "Pi" provides a deterministic compute substrate. A question about a given piece of server software seems to be on-topic to me, irrespective of the underlying compute platform.

Very rarely is the underlying hardware platform (especially in this age of virtualization) a factor at all in the correct operation of a piece of server software. The performance of a "Pi" may suck and the reliability may be questionable but software executing on a "Pi" is going to execute the same as on any other platform applicable to that software.