ci(publish): fix expression syntax

Author: goldenstein64

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
         run: luarocks pack *.rockspec
 
       - name: Publish to LuaRocks
-        run: luarocks upload --api-key=${ secrets.LUAROCKS_API_KEY } *.rockspec
+        run: luarocks upload --api-key=${{ secrets.LUAROCKS_API_KEY }} *.rockspec
 
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2