build: add support for `haskell.nix`

Status Job ID Name Coverage
  Cabal
failed #12965
cabal

 
  Stack
skipped #12966
stack
 
  Bench
skipped #12967
allowed to fail manual
bench
 
  Test
skipped #12968
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