Add test for embedFile from the file-embed package #2159

Job	Run time
cabal	2m 36s
cabal-doExactConfig	3m 31s
multi-target	2m 40s
nix-build	7m 29s
runghc	2m 37s
shellFor-single-package	2m 44s
unit-tests	10s
tests-benchmarks	1m 12s
build-extra-hackages	3m 11s
docs	1m 4s
hydra-ifdLevel-0-and-1	24s
hix	56s
hydra-ifdLevel-2	13s
hydra-ifdLevel-3-and-ghc-8-10	12s
hydra-ifdLevel-3-and-ghc-9-2	47s
maintainer-scripts	11s
plan-extra-hackages	12s
shellFor-hoogle	13s
shellFor-multiple-package	43s
shellFor-not-depends	36s
check-materialization-concurrency	24s
check-path-support	11s
closure-size	8s
haskell-nix-roots-do-not-require-IFDs	9s
hix-cabal	24s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	11s
hydra-without-remote-builders	2m 2s
nix-tools	2m 27s
update-docs	8s
	37m 45s

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