As long as you can select the SD card in the bios boot menu, you should be able to install an OS there and run anything. Just be aware that the life of the SD card will be short if your server write data continuously to the SD card (e.g. excessive logging). Even if you don’t do any excessive write, SD cards tend to have shorter life than SSD anyway, so make sure you have a disaster recovery plan so you won’t get caught off guard when your SD card suddenly fails.