The tension in any system is how many ways the build can fail other than the most obvious one. So I generally only encourage things in the pre-commit hook like no weird punctuation (I'm looking at you, Microsoft), no empty commit messages, and maybe require a ticket number (or try to guess one out of the branch name).

Though it would be sort of interesting or maybe just amusing if you made something like ssh-agent but for 'git commit' and your test runner. Only allow commits when all files are older than your last green test run.