Hm, I have wanted to get RISC-V support on builds.sr.ht, but there are a couple of problems. The main blocker is that I still haven't got a good Alpine port finished for it, the main blocker for that being the lack of a good bootloader available that lets me load a kernel from the filesystem. uBoot is almost there but they need to add an mmc driver before it's ready. Once that's available (or after I have time to investigate it myself), I'll be rebuilding the Alpine port on top of a stable release, then I can start thinking about putting together support for builds.sr.ht.