Only redirect to buildable targets (#2356) #3087

Job	Run time
cabal	55s
nix-build	37s
unit-tests	41s
cabal-doExactConfig	1m 2s
multi-target	35s
maintainer-scripts	34s
runghc	45s
shellFor-hoogle	50s
shellFor-multiple-package	12s
shellFor-not-depends	15s
shellFor-single-package	27s
tests-benchmarks	8s
build-extra-hackages	32s
check-materialization-concurrency	19s
check-path-support	43s
closure-size	8s
docs	9m 33s
haskell-nix-roots-do-not-require-IFDs	31s
hix	1m 10s
hydra-ifdLevel-0-and-1	7m 57s
hydra-ifdLevel-2	20m 11s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc9102	53s
hydra-without-remote-builders-ghc967	18s
plan-extra-hackages	8s
update-docs	4s
hix-cabal	3m 58s
nix-tools	38s
	1h 24m 19s

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