Run CI on both pull and push with master

[mrseanryan]

Run CI for PRs, by running both for pull and push with master branch.

ref:

• https://github.com/backdrop-contrib/bee/commit/5bd12eb11a60adbe41aab7f4ff27181c8a12dc85
• https://stackoverflow.com/questions/70767090/github-actions-on-push-and-on-pull-request-difference#:~:text=In%20general%2C%20push%20will%20trigger,from%20a%20fork%20for%20example.