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CI/CD actions for pull/merge requests are a nightmare. When a developer writes test/verification steps, they are mostly in the mindset "this is my code running in the context of my github/gitlab account", which is true for commits made by themselves and their team members.

But then in a pull request, the CI/CD pipeline actually runs untrusted code.

Getting this distinction correct 100% of the time in your mental model is pretty hard.

For the base case, where you maybe run a test suite and a linter, it's not too bad. But then you run into edge cases where you have to integrate with your own infrastructure (either for end2end tests, or for checking if contributors have CLAs submitted, or anything else that requires a bit more privs), and then it's very easy byte you.