build

fixed nix, formatted #2

Job	Run time
build (ubuntu-latest, 5.0, true, true, true)	44s
build (ubuntu-latest, 4.13, true, true, true)	45s
build (ubuntu-latest, 5.1, true, true, true)	43s
build (ubuntu-latest, 4.14, true, false, true)	52s
build (macos-latest, 4.14, true, false, true)	1m 13s
build (ubuntu-latest, 5.2, true, true, true)	44s
build (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-32bit, true, false, true)	1m 26s
build (macos-latest, 5.3, true, false, true)	5m 35s
build (ubuntu-latest, 5.1, false, false, true)	52s
build (windows-latest, 4.14, true, false, true)	2m 49s
build (ubuntu-latest, ocaml-variants.5.3.0+options,ocaml-option-32bit, true, true, true)	1m 3s
build (ubuntu-latest, 5.3, false, false, false)	49s
build (windows-latest, 5.3, false, false, true)	3m 3s
	20m 38s

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