chore(github): add conventional commits check

[nowNick]

Summary

This commit adds action-conventional-commits gh action

Checklist

• [ ] ~N/A~ The Pull Request has tests
• [ ] ~N/A~ A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• [ ] ~N/A~ There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Full changelog

N/A

Issue reference

KAG-1290

[nowNick]

Oh! Thanks @dndx for pointing that out!

Let me make sure I understood you correctly. What we care about is following Conventional Commits standards on master branch. However when you Squash & Merge a PR, there's a new commit created, so it does not really matter whether the PR followed CC standards or not, because all of those commits will become the new commit?

We could try to consider enforcing PR title standards, because from what I can see GH uses PR title as a placeholder for the Squash&Merge commit message. However since it's still can be edited by a user, I don't think it makes sense to enforce it like that anyway.

So I guess we should just drop this PR and update the ticket with proper message.

Does it sound ok? 👍 / 👎 ?