[Feature]: Build pipeline improvements

[codemile]

Feature Request

The build pipeline for PRs could be improved.

• [ ] support PR types (GitHub's default triggers for PRs have problems) adding types fixes some of those
• [ ] support concurrency groups (i.e. if a PR receives a new commit, any running builds on that PR should cancel and start over with latest changes)
• [ ] support "yarn install" caching to speed up builds (optional)
• [ ] run "yarn build", "yarn test" and "yarn lint" as parallel tasks for better performance (requires caching)
• [ ] fail a PR if "yarn lint" finds issues
• [ ] add prettier support to "yarn lint"
• [ ] skip "yarn build" if PR is in draft mode, but run "yarn test/lint" (this is opinionated)

Future pipeline improvements (to be discussed)

• add test coverage reports to PR comments automatically
• add GitHub hooks that automatically lint/prettier code when pushing changes (to ensure code styling standards)

Code of Conduct

• [X] I agree to follow this project's Code of Conduct