Filter Haskell jobs for Nix CI (#155) This applies the same filtering as I use for Garnix. It reduces the number of jobs without excluding any derivations.
| Time to Start | Worker time | Duration | Time to finish | |
| Config | 0s | 1s | 1s | 2s |
| Eval | 3s | 6s | 6s | 9s |
| Build | 10s | 1m11s | 1m14s | 1m24s |
| Suite | 0s | 1m19s | 1m23s | 1m24s |