BuildReports: Add test report log

[ysangkok]

The test report log contains the actual output emitted by the test-suite
in a given Cabal package.

The test log only contains the logs of the build of the test.

Fixes #1397.

Demo

These were the logs as emitted by cabal run exe:hackage-build -- build testpkg -v:

Downloading
http://localhost:8080/package/testpkg-0.4.0.1/testpkg-0.4.0.1.tar.gz
Unpacking to testpkg-0.4.0.1/
Building testpkg-0.4.0.1
cabal
--config-file=/home/janus/flipstone/hackage-server/build-cache/cabal-config
v1-install --enable-documentation
--htmldir=/home/janus/flipstone/hackage-server/build-cache/tmp-install/haddocks/$pkgid-docs
--disable-optimization --ghc-option -O0 --disable-library-for-ghci
--package-db=clear --package-db=global
--package-db=/home/janus/flipstone/hackage-server/build-cache/tmp-install/packages.db
--reinstall --force-reinstalls
--haddock-html-location=/package/$pkg-$version/docs
--haddock-contents-location=/package/$pkg-$version --haddock-hyperlink-source
--prefix=/home/janus/flipstone/hackage-server/build-cache/tmp-install
--build-summary=/home/janus/flipstone/hackage-server/build-cache/tmp-install/reports/$pkgid.report
--report-planning-failure --haddock-html --haddock-hoogle
--haddock-option=--quickjump testpkg-0.4.0.1
Build results for testpkg-0.4.0.1:
/home/janus/flipstone/hackage-server/build-cache/results/testpkg-0.4.0.1.report
/home/janus/flipstone/hackage-server/build-cache/results/testpkg-0.4.0.1-docs.tar.gz
/home/janus/flipstone/hackage-server/build-cache/results/testpkg-0.4.0.1.log
Testing testpkg-0.4.0.1
cabal
--config-file=/home/janus/flipstone/hackage-server/build-cache/cabal-config
v2-test all --enable-coverage
--test-log=/home/janus/flipstone/hackage-server/build-cache/tmp-install/reports/testpkg-0.4.0.1.test
--test-show-details=never --disable-optimization
Test results for testpkg-0.4.0.1:
/home/janus/flipstone/hackage-server/build-cache/results/testpkg-0.4.0.1.test

Cabal file fragment:

test-suite simple
    main-is: Main.hs
    hs-source-dirs: test
    type: exitcode-stdio-1.0
    build-depends: base >=4 && <5
    default-language: Haskell2010

Main.hs (of test-suite) contents:

main = putStrLn "this is printed from custom test suite"

[gbaz]

this looks good to me. @bgamari i think we'll need to deploy the builder and the main hackage in sync for this... when you get time, take a look and then we can coordinate?

[ysangkok]

I tried testing the migration locally, and I am getting an error with Acid.Core "too few bytes". So there must be some problem with this PR, or maybe it is exposing an existing issue... I will report back if I find out what the problem is. I think I'll try to write a unit test for this.

[ysangkok]

I've done some migration testsusing the following REPL code:

ghci> :set -XScopedTypeVariables 
ghci> :m +Distribution.Server.Features.BuildReports.BuildReports Data.Acid.Core Data.SafeCopy Data.Map Test.QuickCheck Data.Either
ghci> b :: PkgBuildReports_v4  <- generate arbitrary
ghci> isRight (serialiserDecode safeCopySerialiser (serialiserEncode safeCopySerialiser b) :: Either String PkgBuildReports)
True

I still haven't discovered any issues...

[ysangkok]

@gbaz Do you have any ideas for how to advance this? I'd be curious to know if you can reproduce my issue with your local instance.