CI build sometimes breaks on push with error 403

[tomvik]

So the error logs can be seen here: https://github.com/RoBorregos/Robocup-Home/runs/1231296520?check_suite_focus=true#step:3:28

Perhaps something similar to the link below is happening with us. If it is only occurring on push, then I see no big issue while the PR has been properly checked and there are no direct pushes to develop.

https://github.community/t/occasionally-authenticating-with-github-token-fails-when-doing-git-push/18229/5

Or maybe it is related to this issue, however it seems like we're using the new key and not the old one:
https://answers.ros.org/question/325039/apt-update-fails-cannot-install-pkgs-key-not-working/