I was curious so I took a look around at what some other code quality tools do with GitHub PRs.
- Codacy: Adds inline comments and a summary commit, like Sonar used to do: https://support.codacy.com/hc/en-us/articles/207280219-GitHub-Integration
- CodeClimate: Adds inline comments and a summary commit with a nice table - https://docs.codeclimate.com/docs/github-pull-requests
- Also has a browser extension you could use to display issues inline in the GitHub UI without actually creating PR comments. https://codeclimate.com/browser-extension/
- I find most developers don’t proofread their own PRs, so an extension would not be as useful as real inline PR comments, in my opinion
- Codebeat: Doesn’t seem to put inline comments on PRs: https://hub.codebeat.co/docs/pull-requests