Fix Conflicting keyring values in app-vscode.sh

[neidiom]

I was getting this error:

wget -qO- https://omakub.org/install | bash
________ __ .
__ \ _____ _____ | | ____ _ |_
/ | \ / __ \ | |/ / | \ __
/ | \ Y Y / __ | <| | / _\
_______ /|| (___ /|_ _/| /
/ / / / /

=> Omakub is for fresh Ubuntu 24.04+ installations only!

Begin installation (or abort with ctrl+c)...
E: Conflicting values set for option Signed-By regarding source https://packages.microsoft.com/repos/code/ stable: /etc/apt/keyrings/packages.microsoft.gpg != /usr/share/keyrings/microsoft.gpg E: The list of sources could not be read.

The Problem I Faced

When I first tried to run the installation, I immediately ran into a problem that had a conflict in the software sources. The repository for Microsoft VS Code was defined in more than one place, and these definitions were secured with two different, conflicting GPG keys. This created a deadlock; apt would refuse to do anything until the conflict was resolved, which in turn caused the installation script to fail right at the start.

[Kasui92]

From what I understand, the problem occurs if the Microsoft VS Code repository has already been added to the APT sources and the VS Code installation script for Omakub is run. By not performing an existence check, you simply add another layer, creating a conflict.

At this point, wouldn't it be enough to simply implement a check in the part where the repository is added that bypasses and switches to the VSCode installation if already present?

This way, we avoid having to clean up and re-add it every time.

[neidiom]

I have taken a more gentle approach.

[Kasui92]

@neidiom
IMO, the script generates too much noise (due to comments, both printed to the terminal and in the script) and performs unnecessary checks/steps.

It's sufficient an initial check that only verifies whether the GPG keys and Microsoft repo have already been added. If so, it continues with the VSCode installation from APT; otherwise, it adds the mirrors first and then continues.

This allows for much less clutter and keeps the code clean.

[neidiom]

@Kasui92 please check now. I wrapped the repo setup part into a function.

[Kasui92]

Exactly! It all seems correct to me 👍🏻

[Kasui92]

This PR closes #521