Try to build with GitLab CI

1 job for master in 48 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #580
build

00:00:48

 
Name Stage Failure
failed
build Test There is an unknown failure, please try again
Cloning repository...
Checking out debcf723 as master...
Skipping Git submodules setup
$ stack build
Could not parse '/builds/league/bookme/stack.yaml':
Aeson exception:
Error in $['extra-deps'][0]: failed to parse field 'extra-deps': expected PackageIdentifier, encountered Object
See http://docs.haskellstack.org/en/stable/yaml_configuration/
ERROR: Job failed: exit code 1