CI: hopefully fixed the emscripten deployment if the working tree is dirty

Author: mgerhardy

.github/workflows/main.yml

@@ -142,6 +142,7 @@ jobs:
             mkdir wasm
             mv cavepacker.* wasm
             mv caveexpress.* wasm
+            git checkout -f
             git checkout origin/deploy
             mv wasm/* .
             git status