Expose the nix-tools as flake apps #2574

Job	Run time
build-extra-hackages	51s
cabal-doExactConfig	26s
check-materialization-concurrency	27s
cabal	38s
check-path-support	45s
closure-size	9s
docs	12m 55s
haskell-nix-roots-do-not-require-IFDs	16s
hix	6m 16s
hix-cabal	4m 58s
hydra-ifdLevel-0-and-1	3m 49s
hydra-ifdLevel-2	9m 44s
hydra-ifdLevel-3	30m 17s
hydra-without-remote-builders-ghc8107	2m 16s
hydra-without-remote-builders-ghc9101	2m 44s
maintainer-scripts	8s
multi-target	46s
nix-build	10m 34s
nix-tools	9s
plan-extra-hackages	6s
runghc	9s
shellFor-hoogle	15s
shellFor-not-depends	12s
shellFor-multiple-package	16s
shellFor-single-package	14s
tests-benchmarks	8s
unit-tests	5s
update-docs	4s
	1h 29m 37s

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