Checks if the current environment is a Continuous Integration server.
This is a Haskell port of watson/ci-info.
Check if the current environment is a CI server:
isCI :: IO Bool
Get the name of the CI vendor. Returns Nothing
if no CI could be detected. Returns Just CI_UNKNOWN_VENDOR
if a CI was detected, but the vendor name could not be determined:
getCI :: IO (Maybe CI)