build: add support for `haskell.nix`

Status Job ID Name Coverage
  Cabal
failed #11955
cabal

 
  Stack
skipped #11956
stack
 
  Bench
skipped #11957
allowed to fail manual
bench
 
  Test
skipped #11958
test
 
Name Stage Failure
failed
cabal Cabal There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace