Nix CI

Add `cvector-generator` example (#7514) #6

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Run time

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Job	Run time
nix-eval (ubuntu-latest)	2m 18s
nix-build (ubuntu-latest)	2m 4s
nix-eval (macos-latest)	3m 29s
nix-build (macos-latest)	2m 39s
	10m 30s