chore(ci): better specify how to trigger Github Actions

[StephenSorriaux]

Why is this needed?

Current configuration of Github Actions only trigger on push on the repo, but not on pull requets, which is kind of limited.

Proposed Changes

• trigger GA on push to master and release/* branches
• trigger GA on pull request with master or release/* branches as destination

Does this PR introduce any breaking change?

Nah