chore: prevent duplicate CI runs

[kiendang]

We have this in our workflows

on: [push, pull_request]

This is redundant since when someone pushes to a PR branch, it triggers both push and pull_request synchronized which makes the action runs twice. Checking every PR CI and you will see we have the every check run twice (push) and (pull_request).

Just on: push is enough.

[erikwrede]

If I'm not mistaken, the push condition does not apply to forks - that's why the PR trigger is necessary. Setting push to branch Master only should do the trick 😊

[kiendang]

Yup that makes perfect sense.