Use GitHub App for codeowner validation and remove hacky script #8
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We shouldn't use personal access tokens, instead we created a GitHub App with read-only access to just this repository.
While codeowners-validator supports GitHub App authentication, the same cannot be said for the hacky script I wrote because there was no support for checking write access: mszostok/codeowners-validator#157
Instead of trying to hack the script more to make it work with GitHub App authentication, I decided to implement it into codeowners-validator itself: mszostok/codeowners-validator#222
Because it's not merged/released yet, we need to build it ourselves, so I added some Nix to do that reproducibly.
Testing this in #9