fix: stop old c4 container before starting renamed games container

The renamed container can't bind port 8080 while the old c4 container
still holds it.

.gitea/workflows/deploy.yml

@@ -58,5 +58,8 @@ jobs:
         run: |
           mkdir -p $DEPLOY_DIR/data
 
+      - name: Stop old c4 container if running
+        run: docker rm -f c4 2>/dev/null || true
+
       - name: Rebuild and restart
         run: cd $DEPLOY_DIR && docker compose up -d --build --remove-orphans