Commit CI just provide a debug version of the app (which is more useful for developer), and requires users to login in to get its artifacts. That's not good enought. It's possible to make the Nightly build only available in this repository and not in its forks. I will work for it.

Nightly build failure is mainly caused by make release, the first thing it does is copying OpenCC's data to app assets directory. But due to our cache mechanism, which will not fetch submodules if there are caches to utilize, copying OpenCC's data could be never succeeded, and contribute to the CI failure. All of these can be fixed, don't worry.

It's possible to make the Nightly build only available in this repository and not in its forks. I will work for it.

P.S. I don't do this because I tested the Release build on my fork. It may be the time to improve.

Found another issue: the nightly tag breaks change log generation.

If we want provide direct download for user without login, we can add another workflow.

1. It won't break the current release flow.
2. Logic is clear
3. Single responsibility principle

If the pull request was approved, the nightly must be removed or it will break current release flow.