Attempt to use different haskell image in CI

1 job for master in 15 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
failed build #1076

00:00:15

 
Name Stage Failure
failed
build Test There is an unknown failure, please try again
Successfully extracted cache
$ mkdir -p /cache/root-stack
$ ln -s /cache/root-stack /root/.stack
$ stack test
Downloading lts-13.19 build plan ...
Downloaded lts-13.19 build plan.
Compiler version mismatched, found ghc-8.6.5 (x86_64), but expected minor version match with ghc-8.6.4 (x86_64) (based on resolver setting in /builds/league/bookme/stack.yaml).
To install the correct GHC into /root/.stack/programs/x86_64-linux/, try running "stack setup" or use the "--install-ghc" flag.
ERROR: Job failed: exit code 1