Add doc building to our CI setup
Add doc building to our CI setup

pgroudas/fabric,TarasRudnyk/fabric,bspink/fabric,raimon49/fabric,tolbkni/fabric,rodrigc/fabric,cgvarela/fabric,likesxuqiang/fabric,amaniak/fabric,haridsv/fabric,MjAbuz/fabric,tekapo/fabric,kmonsoor/fabric,pashinin/fabric,sdelements/fabric,ploxiln/fabric,qinrong/fabric,cmattoon/fabric,jaraco/fabric,askulkarni2/fabric,rbramwell/fabric,kxxoling/fabric,hrubi/fabric,elijah513/fabric,itoed/fabric,bitprophet/fabric,bitmonk/fabric,opavader/fabric,SamuelMarks/fabric,rane-hs/fabric-py3,xLegoz/fabric,StackStorm/fabric,mathiasertl/fabric,fernandezcuesta/fabric