Add prerelease ghc 9.8.1 from GitLab commit #810

Job	Run time
cabal-doExactConfig	1m 15s
runghc	16m 58s
cabal	1m 47s
nix-build	10m 43s
unit-tests	1m 5s
build-extra-hackages	48s
check-materialization-concurrency	22s
check-path-support	1m 20s
closure-size	57s
docs	8m 48s
haskell-nix-roots-do-not-require-IFDs	1m 0s
hix	17m 36s
hix-cabal	5m 43s
hydra-ifdLevel-0-and-1	1m 5s
hydra-ifdLevel-2	34s
hydra-ifdLevel-3-and-ghc-8-10	2m 22s
hydra-ifdLevel-3-and-ghc-9-2	2m 13s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	24s
hydra-without-remote-builders	21s
maintainer-scripts	15s
multi-target	1m 3s
nix-tools-build	7m 52s
plan-extra-hackages	25s
shellFor-hoogle	43s
shellFor-multiple-package	57s
shellFor-not-depends	49s
shellFor-single-package	51s
tests-benchmarks	25s
update-docs	10s
	1h 28m 51s

Provide feedback