Add nix to pre-commit image #89

Job	Run time
build (linux/arm64, ubuntu-24.04-arm, documentation)	2m 18s
build (linux/amd64, ubuntu-24.04, pre-commit)	1m 51s
build (linux/arm64, ubuntu-24.04-arm, pre-commit)	2m 0s
build (linux/amd64, ubuntu-24.04, signing)	1m 3s
build (linux/arm64, ubuntu-24.04-arm, signing)	1m 25s
build (linux/amd64, ubuntu-24.04, documentation)	1m 29s
merge	0s
	10m 6s

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