`om health`: Shell dotfiles are Nix-managed #1288

Job	Run time
main (x86_64-linux, false)	1m 25s
main (aarch64-darwin, false)	2m 8s
static-binary-check (ubuntu-latest)	4s
website	0s
static-binary-check (macos-latest)	5s
	3m 42s

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