Improve cabal/stack caching in CI. (#1019)
Improve cabal/stack caching in CI. (#1019)


HIPERFIT/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark