[DevOps] CMake configuration for native and cross compilation

[ele-dev]

At the moment the cmake config only allows native builds (host=target system). Since the most common target is a raspberry pi
OS running on ARM architecture, it would be very handy to add the option for cross compilation (e.g. host=x86, target=aarch64).
This way, releases including executable binary + config file for arm systems could be created on the developer machine.