This is a B450 Ryzen motherboard with an Athlon 200GE (low power) CPU, 16GB of RAM and 4x 4TB SATA drives, plus a 120GB M2 SSD.
DroneCI is just a build runner, but usually they're CPU-bound, not IO-bound. I do run DroneCI on my Ryzen 5800 in Docker on my main workstation.
The CPU on the NAS is under-powered, but I'd expect to see the CPU meter at 100% most of the time, since it'd be struggling to cope under the load. But the average is around 12-15% at idle and 20-25% when running a build.