I've tried various different ways to get an OSX iso booted on Linux (system76 laptop) and it's been very problematic. Is the trick to run Linux on mac hardware

I've tried various different ways to get an OSX iso booted on Linux (system76 laptop) and it's been very problematic. Is the trick to run Linux on mac hardware and then run the VM host on top of that? If so, why do that, why not just run a VM using virtual box, for example, with OSX inside OSX. Does the lower resource Linux host make it so you can run more VMs (or better specs)? I'm definitely interested in building a bunch of development images as VMs. The setup of Apple development (signing and notarizing) is so opaque that I'm always terrified our CI will get broken with some small upgrade that I want to save stable images frequently, and this seems perfect for that.