Last thursday, we a had a short discussion about possibly changing the merge process to allow unsquashed commits and the use of the github merge button. One sticking point is that we'd like an automatic way to enforce some commit message metadata requirements and formatting.
Git lets you define some hooks for validating commits and commit messages locally, see https://git-scm.com/book/gr/v2/Customizing-Git-Git-Hooks. Specifically, you can define a commit-msg hook which gets to validate the file containing the commit message before allowing the commit. I think https://developer.github.com/webhooks/ can be leveraged to do the same checks on a github PR prior to allowing the PR to be merged, but haven't had time yet to figure out precisely how. -Sam
