Add nix to pre-commit image (#94) #90

Job	Run time
build (linux/arm64, ubuntu-24.04-arm, signing)	1m 25s
build (linux/amd64, ubuntu-24.04, signing)	1m 13s
build (linux/arm64, ubuntu-24.04-arm, documentation)	2m 10s
build (linux/amd64, ubuntu-24.04, documentation)	1m 40s
build (linux/arm64, ubuntu-24.04-arm, pre-commit)	2m 14s
build (linux/amd64, ubuntu-24.04, pre-commit)	2m 2s
merge (pre-commit)	21s
merge (documentation)	23s
merge (signing)	14s
	11m 42s

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