add gitlab-haskell
add gitlab-haskell

simonmichael/stackage,jonschoning/stackage,soenkehahn/stackage,fpco/stackage,asr/stackage,clinty/stackage,iand675/stackage,fimad/stackage,athanclark/stackage,spencerjanssen/stackage,stackbuilders/stackage,Daniel-Diaz/stackage,michalkonecny/stackage,massysett/stackage,mrkkrp/stackage