Add materialized ghc-toolchain.nix on aarch64-darwin #3067

Job	Run time
cabal	1m 12s
build-extra-hackages	42s
cabal-doExactConfig	44s
check-materialization-concurrency	19s
check-path-support	21s
closure-size	3s
docs	10m 7s
haskell-nix-roots-do-not-require-IFDs	1m 11s
hix	1m 24s
hix-cabal	20s
hydra-ifdLevel-0-and-1	8m 5s
hydra-ifdLevel-2	9m 13s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	4m 31s
hydra-without-remote-builders-ghc967	3m 28s
maintainer-scripts	34s
multi-target	38s
nix-build	6m 11s
nix-tools	11s
plan-extra-hackages	5s
runghc	8s
shellFor-hoogle	14s
shellFor-multiple-package	15s
shellFor-not-depends	17s
shellFor-single-package	19s
tests-benchmarks	10s
unit-tests	5s
update-docs	5s
	1h 21m 8s

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