update workflow

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
         with:
           name: build-for-server-import
           path: |
-            game.tar.gz
+            game.zip
 
       - name: What next?
         run: echo "To export the game to the Game Server, open https://adam.math.hhu.de/import/trigger/${GITHUB_REPOSITORY,,} \n Afterwards, you can play the game at https://adam.math.hhu.de/#/g/${GITHUB_REPOSITORY,,}"