fix: 修复 Prepare Linux artifacts 中的 cp 命令

- 去掉通配符，明确指定文件名
- 避免多个源文件时目标路径冲突

Author: nanbert

.github/workflows/release.yml

@@ -80,7 +80,7 @@ jobs:
           rm -rf release/tank_battle
           mkdir -p release/tank_battle
           cp -r assets release/tank_battle/
-          cp target/x86_64-unknown-linux-gnu/release/tank_battle* release/tank_battle/tank_battle
+          cp target/x86_64-unknown-linux-gnu/release/tank_battle release/tank_battle/tank_battle
           cp COPYRIGHT LICENSE README.md release/tank_battle/
           cd release
           tar czf ../tank_battle_linux_x64.tar.gz tank_battle/