Add github workflow option for trusted signing

[sandercox]

I guess I was developing this alongside with the work @Levminer has been doing. Trying to add the solution for this to the Docs I stumbled upon the new section that is only a week old with similar instructions.

The solution I appended is for people that want to just use GitHub actions for releasing their tooling and installs all the code for this in GitHub Actions only.

I personally made the signCommand config part of a override tauri.conf with production settings as I didn't want have the settings to codesign locally.

@Levminer did a great job but the wrapper tool in Rust is a bit overkill in my opinion and you still need all the other parts installed manually. I wasn't able to use the official TrustedSiging GitHub action either as I wasn't singing in their GitHub action, but wanted to invoke it from the Tauri side.

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