Add --enable-split-sections to cabal CI

.gitlab-ci.yml

@@ -8,7 +8,7 @@ variables:
 .build:
   script:
     - cabal update
-    - cabal v2-install cabal-install --installdir=$(pwd)/out --install-method=copy --overwrite-policy=always
+    - cabal v2-install cabal-install --installdir=$(pwd)/out --install-method=copy --overwrite-policy=always --enable-split-sections
   artifacts:
     expire_in: 2 week
     paths: