Automatic mirroring of Common.css

[headquarter8302]

Using GitHub Actions, we can fetch data from the wiki from any URL and then commit it to the Common.css file we have. Essentially having a working automatic mirror.

The current action is as follows:

1. Runs at 0:00 UTC every day or be dispatched manually (the most amount of time a GH Action can be automatically triggered is every 5 minutes).
2. Checks out the repo.
3. Sets the git user as myself, will change it to the user actions if PR passes.
4. Fetches plaintext from https://youtube.fandom.com/wiki/MediaWiki:Common.css?action=raw.
5. Commit it to main.

[Saurmandal]

As someone who knows nothing about auto mirroring, this is pretty cool.

[headquarter8302]

Should we implement this?

[headquarter8302]

It should also be noted that the Action fails when the main branch is equal to the fetched revision

[headquarter8302]

Action now handles errors gracefully. @Saurmandal merge?