Hi! As far as I know there is no lining that will offer moisture or mold protection. If anything anykind of lining (that doesnt breathe) will actually increse these problems (condensation and stagnant air beetwen walls and lining).
The most elegant solution is to paint it white. Now there are mold-unfriendly paints out there but I wouldnt use them (dont need to introduce toxins to my grow closet).
Matt white paint with titanium oxide is the best option in as far as I can tell. If you want highest possible reflection then use mylar or similar.
As for humidity and mold issues... just make sure you have plenty of air movement and even with higher RH levels you shouldnt have mold related trouble.
cheers