Fix a potential cache poisoning (#1124)
Fix a potential cache poisoning (#1124)

May fix https://github.com/tweag/rules_haskell/issues/1495
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration