ci: check conventional commits

[chihiro-adachi]

Why

Currently, all commits in the PR branch cannot be merged unless they follow Conventional Commits.
However, since we are using Squash Merge, it is sufficient if the PR title is a Conventional Commit, so the current rule is excessive.

What

Added GitHub Action to check PR Title.
see: https://github.com/amannn/action-semantic-pull-request

The following settings are required.

Setting > General > Pull Requests

• Allow squash merging のみチェックする
• Default commit messageをPull Request Titleに変更

Setting > Rules > Rulesets

• Targetsをinclude default branch
• Require status checks to passを有効にし、Validate PR Titleを追加する

How to test

2024-10-22.14.47.59.mov

Checklist

• Read CONTRIBUTING.md
• Updated documentation if it is required.
• Added/updated tests if it is required. (or tested manually)
• Passed pnpm lint and pnpm test on the root directory.

[tasshi-me]

LGTM!

[tasshi-me]

scopesオプションでscopeの制限もかけれそうだけど、一旦はconventional commitsのフォーマットに従っているかのチェックだけで良さそう。