`om health`: Shell dotfiles are Nix-managed #1315

Job	Run time
main (x86_64-linux, false)	2m 24s
main (aarch64-darwin, false)	3m 54s
static-binary-check (ubuntu-latest)	2s
website	0s
static-binary-check (macos-latest)	5s
	6m 25s

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