Add prerequisites to support additional architectures
This is mostly a proof-of-concept to demonstrate the necessary work to support non-x86 architectures. I used aarch64, instead of e.g. powerpc or riscv64, because it is the easiest to test with a real hardware by just using a Raspberry Pi 4.
We should try to keep pressure-vessel as general as possible to avoid carrying around avoidable technical debt.
Edited by Ludovico de Nittis