Work around cabal issue in s390x CI (#1207)

Author: meooow25

.github/workflows/i386.yml

@@ -31,5 +31,5 @@ jobs:
         ghc --version
         cabal --version
         cabal update
-        cabal build all  # Workaround for https://github.com/haskell/cabal/issues/11677
+        cabal build all:tests  # Workaround for https://github.com/haskell/cabal/issues/11677
         cabal test all

.github/workflows/s390x.yml

@@ -53,4 +53,5 @@ jobs:
             ghc-options: -O0
           EOF
           cabal update
+          cabal build all:tests  # Workaround for https://github.com/haskell/cabal/issues/11677
           cabal test all