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It's mostly to tighten my test loop a bit, for physical devices. So here's what this entails:

1. You build your image with mkosi one your development machine, and ask it to serve your image as HTTP. In other words: `mkosi -f serve`.

2. You boot into the target machine once, and register an EFI variable that enables HTTP boot from your development machine. Simply do `kernel-bootcfg --add-uri=http://192.168.47.11:8081/image.efi --title=testloop --boot-order=0`, using @kraxel's wonderful tool.