Test

readme: prevent newcomer pitfall when disabling nix-command #2115

Job	Run time
install-against-unstable	6m 1s
install-flake-against-unstable	6m 29s
install-against-stable	6m 49s
install-flake-against-stable	4m 30s
test-stable	27m 9s
test-unstable	20m 30s
	1h 11m 28s

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