Add new comment instead of updating existing comment.

[ahublersos]

I'm testing out the self-hosted Infro, really like it so far!

I've noticed that if Infro has already posted a comment to a PR and another commit is pushed that changes the Diff Infro shows, Infro updates the existing comment. It would be nice if existing comments were left in place, minimized, and a new comment was added after the new commit.

As an example, Atlantis does this whenever it updates a pull request. It's very helpful to be able to see how commits in the PR change the diff, and having the latest changes right next to the latest commits in a PR is very convenient.

[rouke-broersma]

This need to be at least optional. I have no need for intermediate commit results, I only need to be able to review the change as it is actually going to be merged. A better solution would be to implement github checks for the self-hosted option, because checks are linked to a specific commit, so you can find the check result for that specific result.

Infro could also place a commit-comment instead of a PR comment. You can then find the historical result on the specific commit as well but your PR would not be polluted.

[colethienes]

Would it suffice to make this configurable? As in, an upsert mode if you want to replace the existing diff, and another mode for creating a new diff PR comment for each commit?