See also quickemu which has support for launching macOS using information largely taken from this and similar repositories as well as Windows with TPM and enables all the good features: https://github.com/quickemu-project/quickemu

There is also another promising project called docker-osx which has the best documentation around doing the serial number generation to make iMessage etc work (you can use it in combo with most other methods but the docs are often confusing when I looked about a year ago): https://github.com/sickcodes/Docker-OSX