Fix s390x

Author: wismill

.github/workflows/s390x.yml

@@ -17,6 +17,8 @@ jobs:
   # and even so `ghc -O` is prohibitively expensive.
   build:
     runs-on: ubuntu-latest
+    env:
+      LC_ALL: C.UTF-8
     steps:
     - uses: actions/checkout@v2
     - uses: uraimo/run-on-arch-action@v2.1.1