nixos/xen: declarative `libxenlight`, part I #37337

Job	Run time
get-merge-commit / resolve-merge-commit	4s
Attributes	1m 16s
Eval nixpkgs with aliases enabled	40s
Outpaths (aarch64-linux)	3m 53s
Outpaths (aarch64-darwin)	3m 36s
Outpaths (x86_64-linux)	4m 3s
Outpaths (x86_64-darwin)	3m 41s
Process	1m 20s
Tag	37s
	19m 10s

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