The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack SHA-1.6.4.4@sha256:3b7523df3e2186ae8c5ac78c745efb586814afe9c775b886a747556d9f4d429c
Unpacked SHA-1.6.4.4 to /tmp/stackage-build2452/SHA-1.6.4.4/
> /tmp/stackage-build2452/SHA-1.6.4.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2452/SHA-1.6.4.4$ ./Setup configure --package-db=clear --package-db=global --package-db=/home/circleci/project/builds/nightly/pkgdb --libdir=/home/circleci/project/builds/nightly/lib --bindir=/home/circleci/project/builds/nightly/bin --datadir=/home/circleci/project/builds/nightly/share --libexecdir=/home/circleci/project/builds/nightly/libexec --sysconfdir=/home/circleci/project/builds/nightly/etc --docdir=/home/circleci/project/builds/nightly/doc/SHA-1.6.4.4 --htmldir=/home/circleci/project/builds/nightly/doc/SHA-1.6.4.4 --haddockdir=/home/circleci/project/builds/nightly/doc/SHA-1.6.4.4
Configuring SHA-1.6.4.4...
> /tmp/stackage-build2452/SHA-1.6.4.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/SHA-1.6.4.4$ ./Setup build
Preprocessing library for SHA-1.6.4.4..
Building library for SHA-1.6.4.4..
[1 of 1] Compiling Data.Digest.Pure.SHA ( src/Data/Digest/Pure/SHA.hs, dist/build/Data/Digest/Pure/SHA.o )
> /tmp/stackage-build2452/SHA-1.6.4.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/SHA-1.6.4.4$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181113/SHA-1.6.4.4-2lrCL5e5YA7sXuPdJWRCJ
> /tmp/stackage-build2452/SHA-1.6.4.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/SHA-1.6.4.4$ ./Setup register
Registering library for SHA-1.6.4.4..