I had never heard of this emulator myself...
but here is the github page..might help you out
https://github.com/rofl0r/arnoldI use caprice32
https://github.com/ColinPitrat/caprice32pick what works best for you!

I compiled and tried to use it. Works okay. I can get it to load the disc on boot (i.e. in drive a slot)..but I have to load it manually (from the emulated CPC) sooo..maybe I am missing something?
./arnold -drivea "discimage.dsk"
that is to say
emulator ./arnold
args -drivea "discimage.dsk"
if you use linux anyway...