`om health`: Shell dotfiles are Nix-managed #1319

Job	Run time
main (x86_64-linux, false)	2m 18s
main (aarch64-darwin, false)	3m 53s
static-binary-check (ubuntu-latest)	6s
website	0s
static-binary-check (macos-latest)	7s
	6m 24s

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